In Grimwood, Marcus was in his office planning gym classes for the next year. He was enjoying his peaceful days, now that the spider queen was gone. He only had to worry about classes. At that moment there was a knock on his office door.

-Come in.- Marcus said.

The one who knocked on the door was Miss Grimwood. She entered Marcus's office.

-I see you like your new office, Marcus.- Miss Grimwood said.

-I love it.- Marcus said.

-I came to bring you your mail. The girls say hi.- Miss Grimwood said.

The Grimwood girls were at their parents' house, enjoying their summer vacation. They had written letters to Marcus.

-Let's see what they wrote.- Marcus said.

Marcus opened the envelopes with the letters. The first letter said: "Master Marcus. I send you my regards from Transylvania. I hope to see you again soon.- Signed Sibella.". The second letter said: "Greetings from the forest. I can't wait to see you and the rest of the girls again. Signed Winnie." The second letter said: "Greetings from Egypt. My family and I had fun swimming in the Nile. See you when school starts. Signed Tanis." The fourth letter said: Master Marcus. I can't wait for school to start so I can meet you and the girls again. It's very boring here in the town where I live. Signed Elsa." The fifth letter said: Master, I wish you and the girls were here. It's very fun here in the cemetery where I live. Although I can't wait to see you and my friends again. Signed Ghost." The last letter said: "Dear Professor Marcus. This time with you and the girls at Grimwood was one of the best of my life. I can't wait for the new year to start so we can have more moments like this. Once again, thank you for everything. Signed Amelia." Those were the letters that his students sent him. -I'm glad you're having fun. Now that you don't have to be heroines anymore, you can have a quiet school life.- Marcus said.

-It's a relief. I'm glad you're not fighting the possessed anymore. Now you can enjoy the rest of your school life in peace when you return to Grimwood.- Miss Grimwood said.

-Yes. I'm sure nothing else will happen.- Marcus said.

Marcus relaxed in his chair. He spoke too soon because he didn't know who was about to arrive.

In the mystery machine. The Mystery to Order gang was heading towards Grimwood. The road was dark. In the van, Shaggy and Scooby were hiding in a sheet.

-We'll be in Grimwood soon, boys.- Fred Jones said.

-That's what I'm afraid of.- Shaggy Rogers said.

-That place is dark.- Scooby Doo said.

-Oh come on, not everything had to have been so bad.- Daphne Blake said.

Shaggy and Scooby thinking about it better, remembered that not everything was so bad. They had good times with the Grimwood girls. They were good girls. Sibella once saved them and Scrappy from being eaten by crocodiles. Remembering that, they got out from under the sheet.

-Well no. Not everything was so bad. Scooby and I had grown fond of the girls even though they were monsters.- Shaggy Rogers said.

-They were good girls.- Scooby Doo said.

-Surely they will be happy to see them again.- Daphne Blake said.

-Well...the last time they saw us, was when we ran away from there.- Shaggy Rogers said.

-But they said goodbye to us.- Scooby Doo said.

-Yes. They said goodbye to us with love. They'll be happy to see us, I hope.- Shaggy Rogers said.

Shaggy and Scooby weren't sure what the girls' reaction would be when they saw them, after their farewell.

-They said they had saved them from an evil witch. How could they not be happy to see them?.- Fred Jones asked.

-By the way, what happened to the witch?.- Daphne Blake asked.

-She fell into a volcano. Her and her henchman.- Shaggy Rogers answered.

-That was the end of the evil witch Revolta.- Scooby Doo said.

-As a rationalist skeptic, it's hard to believe that story about the evil witch.- Velma Dinkley said.

-But it's true. Scooby and I lived through it.- Shaggy Rogers said.

-It was an experience that's hard to forget.- Scooby Doo said.

-Whatever. I hope those girls help us.- Fred Jones said.

-With those powers they would be very useful against the master of the monsters.- Daphne Blake said.

-Again with that? I already told you that it can't be real. Scientifically speaking it is impossible for girls to become heroines. It's absurd. It seems like something out of an anime.- Velma Dinkley said.

-You know, I don't remember the girls being able to do that. And you Scooby?.- Shaggy Rogers asked.

-No. I don't remember.- Scooby Doo answered.

-Who knows everything that has happened in Grimwood since we left?.- Shaggy Rogers wondered.

-It's a mystery.- Scooby Doo said.

When they met the girls, they didn't have those powers. That was before Marcus, the threat of the possessed, and the spider queen.

-What a mystery, huh? Well, we're about to find out.- Fred Jones said.

They continued to advance in the mystery machine towards Grimwood. After a good while driving they had already reached their destination. They parked the van near the school and got out to see it.

-Is this Grimwood?.- Daphne Blake asked.

-Do they really teach here?.- Velma Dinkley asked.

-I must be, it looks like a school for monsters to me.- Fred Jones said.

Fred, Daphne and Velma looked at Grimwood School. It looked like one of the places where they solved their mysteries. Shaggy and Scooby had memories of that place.

-Hello again Grimwood.- Shaggy Rogers said.

-I never thought I'd come back to this place.- Scooby Doo said.

-Well, what are we waiting for? Let's ring the bell.- Fred Jones said.

-Yeah, I want to meet those supposed students who claim to be monsters.- Velma Dinkley said.

Fred, Daphne and Velma walked towards the entrance but Shaggy and Scooby didn't move from where they were standing.

-They're not coming?.- Velma Dinkley asked.

-We need time.- Scooby Doo answered.

-We're not ready to meet the girls again yet.- Shaggy Rogers said.

Shaggy and Scooby were nervous about meeting their former students again, after their escape.

Inside Grimwood, Matches was sleeping. He wakes up when he feels a noise. He gets up and starts to smell something, something familiar. Marcus, who was passing by with some papers in his hand, saw him.

-Matches, what's wrong?.- Marcus asked.

Matches kept sniffing, he had already remembered who that smell belongs to. He ran outside to look for them.

-Hey, where are you going?.- Marcus asked.

Marcus left the papers on the table and followed Matches.

They had left the entrance close by. Matches was already outside. He saw that there were three people he didn't know but he did know the two who were behind them. Fred, Daphne and Velma didn't know what Matches was but Shaggy and Scooby knew who the little dragon was.

-Isn't that...?.- Shaggy Rogers couldn't finish the sentence.

Matches ran towards Shaggy and Scooby. He jumped on top of Shaggy, licking him. He was happy to see them despite everything.

- Hehe. I'm glad to see you again too.- Shaggy Rogers said.

-Nice to see you again, Matches.- Scooby Doo said.

-What is that thing?.- Daphne Blake asked.

-It looks like a lizard.- Fred Jones answered.

-I've never seen a lizard like that.- Velma Dinkley said.

At that moment Marcus comes out.

-Parties, where are you...?.- Marcus didn't finish his sentence.

Marcus saw 4 young people he didn't know, and a dog.

-Good morning. How can I help you?.- Marcus asked.

-Hello, by any chance is this Grimwood?.- Fred Jones asked.

-Yes, this is the Grimwood school for ghoul girls.- Marcus answered.

-"Ghouls," did you say?.- Velma Dinkley asked.

-Aaahhh, I get it. You're the new teachers.- Marcus said.

Marcus thought those young people came for the teaching position.

-Teachers?.- Daphne Blake asked.

-You don't know how relieved it is to see you. I had posted the position months ago. I was fed up with Miss Grimwood and I being the only teachers.- Marcus said.

-Do you think we're teachers?.- Velma Dinkley asked.

-Well, they're kind of young for monsters and they're human too. They do know this is a monster school, right? I thought I put that in the notice.- Marcus asked.

-That's what I've been told.- Velma Dinkley answered.

-Is it true that there are monsters at this school?.- Fred Jones asked.

-Oh yeah. We have 6 monster girls here. They might seem a little scary at first but once you get to know them you'll see that they're sweethearts.- Marcus answered.

-Great. I want to see real monsters now.- Fred Jones said.

-What do you mean real?.- Marcus asked.

Velma interrupted them.

-Excuse me, there's been a misunderstanding. We're not teachers.- Velma Dinkley said.

-Oh no. So why are you here?.- Marcus asked.

Shaggy and Scooby were looking at Marcus.

-He was here before, Scooby?.- Shaggy Rogers asked.

-No, it must be new.- Scooby Doo replied.

Marcus saw that Matches was with a boy and a dog.

-Oh Matches, there you were. Who are you with?.- Marcus asked.

Marcus approached Shaggy and Scooby.

-Who are you?.- Shaggy Rogers asked.

-My name is Marcus. I'm the gym teacher at this school.- Marcus replied.

-Are you the new gym teacher? Geez, we've already been replaced Scooby.- Shaggy Rogers said.

-We've been replaced, Shaggy.- Scooby Doo said.

Marcus, hearing their names, remembered his predecessors. The ones his students sometimes talked about.

-Wait a minute. Shaggy and Scooby? You're the previous gym teachers, right?.- Marcus asked.

-Yes. Scooby and I used to work at this school.- Shaggy Rogers replied.

-But we quit.- Scooby Doo said.

-Are they the ones who ran away?.- Marcus asked.

Shaggy gulped upon hearing that.

-Hehe. Yeah.- Shaggy Rogers replied.

-Did they tell you about that?.- Scooby Doo asked.

-Yes, they tell me everything. They also told me that you saved them from an evil witch. Thank you for saving my students that time. You have my deepest respect.- Marcus said.

Marcus was grateful to them for saving his students in the past and they had his respect for that. If he knew what those two were like he would actually have a different perspective. Shaggy and Scooby felt flattered.

-Hahaha. Well thanks. We were just doing our duty.- Shaggy Rogers said.

-It was our duty to take care of our students.- Scooby Doo said.

-By the way. There hasn't been another evil witch again, right?.- Shaggy Rogers asked.

-Yeah, right?.- Scooby Doo asked.

Shaggy and Scooby were a little worried about their students. They were afraid that Revolta wasn't the only evil witch going after the girls.

-I wish.- Marcus answered.

-What do you mean "I wish"? What could be worse than one evil witch?.- Shaggy Rogers asked.

-Two evil witches?.- Scooby Doo asked.

-Believe me, they'd be surprised if they knew.- Marcus answered.

If Shaggy and Scooby knew about the possessed, and the spider queen; the evil witch wouldn't seem so scary anymore.

-Oh, I'll tell Miss Grimwood that you're here. Miss Grimwood! Please come out, we have visitors!.- Marcus called.

Marcus called Miss Grimwood. She heard his voice and went outside.

-What's wrong Marcus? I think I've heard you talking to someone for a while now.- Miss Grimwood said.

Miss Grimwood stopped when she saw who was outside. Her old gym teachers, accompanied by 3 young people.

-Hello Miss Grimwood.- Shaggy Rogers said.

-How long.- Scooby Doo said.

-My eyes don't deceive me? But it's Shaggy and Scooby.- Miss Grimwood said.

Miss Grimwood approached Shaggy and Scooby. She gives Shaggy a hug.

-How long has it been?.- Miss Grimwood asked.

-I'm glad to see you too.- Shaggy Rogers said.

-You look well Miss Grimwood.- Scooby Doo said.

Fred, Daphne and Velma looked at Miss Grimwood.

-Who is she?.- Daphne Blake asked.

-She's the headmistress of the school. Miss Grimwood.- Marcus replied.

-Mmmmm. She looks normal to me. She doesn't look like a monster.- Velma Dinkley said.

-Well, I think Miss Grimwood is a witch. I'm not sure yet though.- Marcus said.

-Miss Grimwood turned to see the people who came with Shaggy and Scooby. She approached them to greet them.

-And who are you?.- Miss Grimwood asked.

-Nice to meet you Miss Grimwood, my name is Daphne.- Daphne Blake said.

-Daphne shook Miss Grimwood's hand.

-I'm Fred, ma'am. Nice to meet you.- Fred Jones said.

-My name is Velma. Are you the headmistress of this supposed monster school?.- Velma Dinkley asked.

-Yes, I've been working here for years. Grimwood is my home.- Miss Grimwood replied.

-Uh huh. In a school for monsters?.- Velma Dinkley asked.

Velma was still not convinced that this was a school for monsters.

-So tell me, what brings you back here?.- Miss Grimwood asked.

-We came to find the girls.- Shaggy Rogers answered.

-We need your help.- Scooby Doo said.

-Your help? For what?.- Miss Grimwood asked.

-Our home was attacked, ma'am.- Fred Jones answered.

-Someone who calls himself the Master of Monsters attacked Crystal Cave with an army of monsters.- Miss Grimwood said.

-My, oh.- Miss Grimwood said.

-What?.- Marcus asked.

-You have no idea. There are vampires, werewolves, mummies, zombies and ghosts. A whole army of monsters.- Shaggy Rogers said.

-I don't understand. I'm not supposed to see any more possessed people.- Marcus said.

-"Possessed"?.- Velma Dinkley asked.

-Oh...no, nothing.- Marcus answered.

Marcus and the girls had gotten rid of all the possessed. So, where did those monsters that Shaggy mentioned come from, and who was this supposed master of the monsters?.

-That's why we came. We need the girls to help us save Crystal Cave.- Shaggy said.

-We've heard that you can now transform into heroines.- Scooby Doo said.

-You guys already know that?.- Marcus asked.

-That's what Shaggy's uncle told us. Personally I don't believe in that stuff.- Velma Dinkley said.

-No, it's all true.- Marcus said.

-In my experience monsters are just guys in costumes.- Velma Dinkley said.

-There were also times when we faced real monsters.- Daphne Blake said.

-Like that time with the witch's ghost.- Fred Jones said.

-Yeah, and I hope I don't have to face a witch again. Right Scooby?.- Shaggy Rogers asked.

-One was enough.- Scooby Doo said.

-The fact that we haven't found a logical explanation for all that, doesn't mean that monsters exist.- Velma Dinkley said.

-I know it may be hard to believe, Ami also had a hard time believing it the first time I saw a monster but my students are real monsters that transform. I also have transformation powers, and I don't want to brag but recently we all saved the world from a monster that was called the spider queen.- Marcus said.

-I get it. This guy is crazy. Do they hire people like that?.- Velma Dinkley asked.

Marcus got a little upset with Velma's comment. He decided to show her what he was talking about.

-I see. You're one of those who have to see to believe. Allow me to show you.- Marcus said.

Marcus prepared to transform.

-TRANSFORMATION! WITCH!.- Marcus shouted.

A light of energy surrounded his body. Turning him into his warlock form. The Mystery Gang was amazed with what they saw.

-Snails.- Shaggy Rogers said.

-It's incredible.- Scooby Doo said.

-And what do you think? This is my wizard form. I also have 4 other forms. With this form I can do magic. Let me show you.- Marcus said.

Marcus used his magic to create a rainbow in the sky. The gang, except Velma, was amazed. After showing them that what they had heard was real, he returned to his normal form.

-Taran!.- Marcus said.

Everyone, except Velma, applauded him.

-Wow that was amazing.- Fred Jones said.

-Can you also pull a rabbit out of your hat?.- Shaggy Rogers asked.

-You should work at parties.- Scooby Doo said.

-Your students can do that too?.- Daphne Blake asked.

-Yes. Although they only have one form, they don't have 5 like me.- Marcus answered.

Velma was speechless.

-But...but...how did you do that?.- Velma Dinkley asked.

-I just transformed.- Marcus answered.

-Transformed? What is that transformation? How can a person transform? Someone explain to me.- Velma Dinkley said.

-Well you see. 2 years ago I met a lich called Alador. He opened a portal to the spirit world. I went in there, met 4 spirits, they gave me their powers and now I have these transformation powers. The girls also got spirits that gave them their powers. All together we saved the world from an evil spider woman called Tirannica who wanted to open the doors of the underworld and conquer the world.- Marcus said.

The Mystery to Order gang was speechless. Had all that happened and they didn't even realize that the world was in danger recently? Velma didn't understand anything Marcus said. She fell to her knees on the ground.

-I give up. I don't understand anything. I just don't get it.- Velma Dinkley said.

-I would love for us to have more time for you to understand but Crystal Cave needs us.- Shaggy Rogers said.

-We need the girls.- Scooby Doo said.

-They went home for summer vacation. I'll call them to come.- Marcus said.

Marcus took out his cell phone and started contacting his students. Luckily, they now had landlines at home to contact their teacher.

In Transylvania, in the castle where Sibella lived, her phone rang.

-I answered.- Sibella said.

Sibella went to answer the phone.

-Hello?.- Sibella asked on the phone.

-Hello Sibella.- Marcus said on his cell phone.

Remember that he is talking on his cell phone and Sibella on her home phone.

-Professor Marcus. How is everything in Grimwood? Ready for our return?.- Sibella asked on the phone.

-That's exactly what I wanted to talk to you about. If you're not too busy, I need you to come to Grimwood, now if possible.- Marcus answered on the phone.

-What? So soon? What's the rush?.- Sibella asked on the phone.

-You see, the thing is this. Your old teachers are here and they need our help.- Marcus answered on the phone.

-Professor Shaggy, Scooby and Scrappy returned to Grimwood?.- Sibella asked on the phone.

-No, only Shaggy and Scooby returned. They need your help to save the home where they live.- Marcus answered on the phone.

-Does that mean what...?.- Sibella didn't finish the question on the phone.

-Yes. It's time for the Grimwood Ghoul Squad to reunite.- Marcus answered on the phone.

-Count on me. If Shaggy and Scooby need me then I will help them.- Sibella said on the phone.

-Excellent. I will let the others know. Wait for Alador to teleport you.- Marcus said on the phone.

-Okay, master.- Sibella said on the phone.

Marcus hung up the call.

-I can't wait to see you again.- Sibella said.

In the middle of a cabin in the woods. It's where Winnie lives with her family. The phone was ringing.

-Mom! Dad, phone!.- Winnie called.

Winnie called but no one answered. So she answered the phone.

-Hello?.- Winnie asked on the phone.

-Hello Winnie.- Marcus said on the phone.

-Master Marcus. He can't wait to see me, can he?.- Winnie asked on the phone.

- Yes, but I called you for something else.- Marcus answered on the phone.

- What?.- Winnie asked on the phone.

- You won't guess who I'm with now in Grimwood?.- Marcus asked on the phone.

- Who?.- Winnie asked on the phone.

- Your old gym teachers. They came with their friends to look for you and the rest of the girls.- Marcus answered on the phone.

- Who do you say is there?.- Winnie asked on the phone.

- Your old teachers, Shaggy and Scooby are back here in Grimwood.- Marcus answered on the phone.

-So? Are they really back? I thought they didn't want to go back to school after the way they left last time.- Winnie said on the phone.

-They came back because they need our help. Their home is in danger.- Marcus said on the phone.

-Their home is in danger?.- Winnie asked on the phone.

-Yes. You don't hold a grudge against them anymore, do you?.- Marcus asked on the phone.

-No. I'm over it.- Winnie answered on the phone.

-Excellent. So we can count on you?.- Marcus asked on the phone.

-Yes. I'm always here to help the Grimwood Ghoul Squad.- Winnie answered on the phone.

-Good. I'm sure they'll be happy to see you again. Wait for Alador to teleport you.- Marcus said on the phone.

-Yes, I'd like to see them again too.- Winnie said on the phone.

Marcus hung up the phone.

-What did they come back with, huh? It must be serious if they returned to the place they feared so much.- Winnie said.

In Egypt, inside a pyramid, which is where Tanis lives, the phone rang.

-I'm coming, mom.- Tanis said.

Tanis answers the phone.

-Hello?.- Tanis asked on the phone.

-Hello Tanis.- Marcus said on the cell phone.

-Professor Marcus, what a nice surprise.- Tanis said on the phone.

-Hey Tanis. Would you mind coming to Grimwood?.- Marcus asked on the cell phone.

-Why? Classes haven't started yet.- Tanis said on the phone.

-Something came up. Your old gym teachers, Shaggy and Scooby are here, and they need our help.- Marcus said on the cell phone.

-Professor Shaggy and Scooby need our help? What's going on?.- Tanis asked on the phone.

-Their home was attacked, that's why they turned to us. We're the only ones who can help them. Can we count on you, Tanis?.- Marcus asked on the phone.

-Count on me master. Nobody messes with my friends.- Tanis said on the phone.

-I'm glad you still consider Shaggy and Scooby your friends. Wait for Alador to teleport you.- Marcus said on the phone.

Marcus hung up the phone.

-Shaggy and Scooby. There's so much I have to tell you.- Tanis said.

In a town somewhere, there was a house isolated from the rest. That was Elsa's residence. Her house phone rang.

-I'll answer.- Elsa said.

Elsa answered the phone.

-Hello?.- Elsa asked on the phone.

-Hello Elsa.- Marcus said on the phone.

-Professor Marcus. What's up with everything in Grimwood?.- Elsa asked on the phone.

-Great. Oh, by the way. Your old gym teachers, Shaggy and Scooby are here.- Marcus answered on the phone.

-They came back? Don't tell me they want to work there again? I'd love to have them back.- Elsa said on the phone.

-No, they didn't come back for that. They came back because they have problems.- Marcus said on the phone.

-Problems?.- Elsa asked on the phone.

-Their home was invaded and they need our help.- Marcus answered on the phone.

-If they need our help it's because they already know that we became heroes, right?.- Elsa asked on the phone.

-Exactly. They need the help of the Grimwood Ghoul Squad. Are you joining us?.- Marcus asked on the phone.

-Of course I'm joining. They're still my friends even though we haven't seen each other for a long time.- Elsa answered on the phone.

-Wonderful. Wait there until Alador teleports you.- Marcus said on the phone.

Marcus hung up the phone.

-Someone invaded his home, huh? I don't know who it is but he'll have to deal with me for bothering my friends.- Elsa said.

In a cemetery, inside a crypt, was Ghost's home. The phone in his house rang.

-I'm coming. Please be patient.- Ghost said.

Ghost answers the phone.

-Hello?.- Ghost asks on the phone.

-Hello Ghost.- Marcus said on the phone.

-Oh, hello Professor Marcus.- Ghost said on the phone.

-Are you busy?.- Marcus asked on the phone.

-I've already finished everything I wanted to do in the summer. Why?.- Ghost asked on the phone.

-It's that we have visitors here in Grimwood and I need you to come to Grimwood now.- Marcus answered on the phone.

-Go to Grimwood now? Who are those visitors?.- Ghost asked on the phone.

-Two of them are your old gym teachers Shaggy and Scooby.- Marcus answered on the phone.

-Are they really there? How nice, I missed them so much. That's why you want me to go to Grimwood, why are they dying to see me again?.- Phantom asked on the phone.

-Not really. They need your help and that of the rest of the students to save their home.- Marcus answered on the phone.

-Their home is in danger?.- Phantom asked on the phone.

-Yes and they need you. I already told Sibella, Winnie, Tanis and Elsa. They said they were coming. What do you think? Do you want to join them too?.- Marcus asked on the phone.

-Master, I'm on my summer vacation. I'm resting from being a heroine. Tell them I'll go when school starts.- Phantom answered on the phone.

Oh! Well, if you don't want I can't...- Marcus didn't finish the sentence.

-Just kidding, silly! Of course I'll go. Tell them to count on me.- Ghost said on the phone.

-Ah, you tricked me. Ok Ghost. Wait until Alador teleports you.- Marcus said on the phone.

Marcus hung up the phone.

-I have to get good for our reunion. No!, I'm fine like this.- Ghost said.

In Alador's castle. He was resting in his chair, drinking something. Suddenly his phone rings and he answers.

-Hello Marcus.- Alador said on the phone.

-Alador. We have a mission from the Grimwood Ghoul Squad.- Marcus said on the phone.

-I thought you guys were done? Why are you going to bring them together again?.- Alador asked on the phone.

-This came up. My students' former gym teachers came here to ask us for help. It turns out that their home was invaded by an army of monsters, led by a certain "Master of the Monsters." - Marcus answered on the cell phone.

-An army of monsters attacked a town? How did I not find out about that? - Alador asked on the cell phone.

Alador worked for the Society of Specters, Ghosts and Retired Spirits of Transylvania. He is supposed to be aware of everything that was happening in the monster society.

-Hey. There are no more possessed people, right? - Marcus asked on the cell phone.

-It would be impossible for them to be possessed. They all returned to the underworld. - Alador answered on the cell phone.

-So they are normal monsters? - Marcus asked on the cell phone.

-That would be the most likely. Although I think something else is going on here. I will have to investigate. - Alador answered on the cell phone.

-Good. While you're at it, tell Amelia to come to Grimwood. I've already contacted the others. All that's left is for you to use your teleportation spell.- Marcus said on the cell phone.

-Ok. I'll do it as soon as possible.- Alador said on the cell phone.

Marcus hung up the cell phone and Alador got up from the couch. He stretched his body.

-Geez. Having to work on my vacation.- Alador said.

No way, when there's danger heroes don't have vacations.

-Amelia! Come here it's an emergency!.- Alador called.

Amelia heard her dad's call and went there.

-Did you call me?.- Amelia asked.

-Yes. You and your friends need to return to Grimwood right away.- Alador answered.

-What's going on?.- Amelia asked.

-Marcus will explain it to you when you get there.- Alador answered.

Alador concentrated his magic to do his teleportation spell.

Back in Grimwood. Marcus had already finished making his calls.

-Ready. That's it. In a few seconds the girls will be here.- Marcus said.

-But how will they get here so soon? Don't they live far away?.- Shaggy Rogers asked.

-Well, they'll just be teleported here.- Marcus answered.

-Aha! It's impossible. The transfer of matter is impossible, it has been demonstrated by scientists several times. I'm sure they won't appear out of nowhere.- Velma Dinkley said.

A magic circle appeared and the Grimwood students came out of it. Velma couldn't believe it anymore, she had been wrong again.

-I don't know what to believe anymore.- Velma Dinkley said.

Velma fell to the floor again on her knees. The first thing the girls saw when they arrived was their former teachers. Shaggy and Scooby also looked at them in surprise, they didn't think they would see them again. They also came out of nowhere, which scared them a little.

-Hey girls.- Shaggy Rogers said.

-You look good.- Scooby Doo said.

The girls were silent for a while.

-Professor Shaggy, Scooby!.- Sibella, Tanis, Elsa and Ghost said.

The four of them ran to greet their old teachers. Amelia didn't go because she didn't know them and Winnie wasn't very excited to see them.

-Professor Shaggy we miss you so much.- Tanis said.

Tanis hugged Shaggy.

-I missed you too.- Shaggy Rogers said.

-We miss you so much too, Scooby.- Sibella said.

Sibella petted Scooby.

-It's good to see you again.- Scooby Doo said.

That's what he said but he wasn't very excited to see them before.

-What are you saying again?.- Ghost asked.

-What do you do now?.- Elsa asked.

-Now Scooby and I solve mysteries.- Shaggy Rogers answered.

-Yes, mysteries.- Scooby Doo said.

-So you're detectives?.- Ghost asked.

-Good for you.- Elsa said.

-And tell me how are you doing with the Calloway Cadets?.- Shaggy Rogers asked.

-They don't live next door anymore, they moved somewhere else.- Sibella answered.

-After the thing with the evil witch, their parents considered that it wasn't safe to be next to a school for monsters.- Tanis said.

-Oh, what a pity.- Shaggy Rogers said.

-We won't be able to say hello to them.- Scooby Doo said.

-There's so much we have to tell them.- Sibella said.

-A lot has happened since they left.- Tanis said.

The girls kept chatting with their old teachers. Winnie and Amelia looked at them.

-Who are those two?.- Amelia asked.

-They're my old gym teachers. Shaggy and Scooby.- Winnie answered.

-The ones who saved them from that evil witch?.- Amelia asked.

-Yes, exactly them. Here they are.- Winnie answered.

-Aren't you going to say hello to them?.- Amelia asked.

-No. I'm not excited to see them again.- Winnie answered.

Winnie was still a little resentful with them. Fred and Daphne saw the whole situation. They couldn't believe what they saw.

-Fred, are you seeing the same thing as me?.- Daphne Blake asked.

-I see it and I don't believe it Daphne. Real monsters.- Fred Jones answered.

-So everything Shaggy and Scooby said was true. Monsters are real. Can you believe it?.- Daphne Blake asked.

-I know Daphne. I know. I'm excited too! Real monsters. Where have they been all my life?, and to think of all that time we wasted chasing masked cretins.- Fred Jones answered.

Fred was excited to see the girls, Daphne was the opposite and Velma was getting worse.

-Monsters are real. Everything I believed turned out to be a lie. Someone give me a scientific explanation!. I need reasoning, please give me reasoning.- Velma Dinkley said.

Velma covered her face with her hands while she was still on the ground, she couldn't stand it anymore. Marcus went and patted her on the back to calm her down.

The girls continued talking to their former teachers.

-Winnie. Aren't you going to come and meet our old teachers? - Ghost asked.

-I'm fine, thanks.- Winnie replied.

Shaggy and Scooby saw that next to Winnie there was a girl they hadn't seen before.

-Who is she? We haven't seen her here before.- Shaggy Rogers said.

-Is she a new student?.- Scooby Doo asked.

-Hi, how are you? I'm Amelia. I enrolled in Grimwood last year.- Amelia replied.

-I really liked it, Amelia.- Scooby Doo said.

-You look a little pale. Are you okay?.- Shaggy Rogers asked.

-No, I look like that because I'm an undead.- Amelia replied.

-Oh, wow. An undead.- Shaggy Rogers said.

-Grimwood is still the same as always.- Scooby Doo said.

Shaggy and Scooby were a little nervous to meet an undead. Winnie noticed their reaction and went to interrupt their conversation.

-I'm sorry to interrupt this happy reunion but Professor Marcus told me that they needed our help.- Winnie said.

There was no time to remember old times. Not when the Master of the Monsters had taken over Crystal Cave.

-Oh, that's right. You have to help us girls. My uncle Albert told me that you are now heroines who help people. Well, we need you to help us.- Shaggy Rogers said.

-But what's going on?.- Sibella asked.

-I can answer that.- Fred Jones said.

Fred and Daphne approached the girls to meet them.

-My name is Fred and this is Daphne.- Fred Jones said.

-I really liked it. Hey, I love your purple hair, it matches your dress.- Daphne Blake said.

-Thanks Daphne. My name is Sibella and these are my classmates.- Sibella said.

-I'm Winnie a werewolf.- Winnie said.

-I'm Tanis a mummy.- Tanis said.

-I'm Elsa a...I'm not sure what I am but I'm the daughter of Frankenstein.- Elsa said.

For those who don't know Frankenstein is a homunculus (It means artificial living being) investigate.

-Frankenstein?.- Daphne Blake asked.

-And I'm the daughter of Dracula.- Sibella said.

-Dracula?.- Fred Jones asked.

As if it wasn't enough to know that monsters exist. Now they also know that Dracula and Frankenstein are real.

-Next me. Hello, my name is Ghost and as you can see I'm a ghost.- Ghost said.

-I'm Amelia, an undead. Who is the one suffering on the floor?.- Amelia asked.

Amelia pointed at Velma.

-Ah, this is Velma. Hey, Velma! Come meet the girls.- Fred Jones said.

Velma stood up and went to meet the girls. She looked at them closely.

-So you are real monsters, right?.- Velma Dinkley asked.

-Yes.- Tanis answered.

-It's not some kind of costume, right?.- Velma Dinkley asked.

Velma touched them to see if they weren't wearing masks or makeup.

-No.- Elsa said.

-If you want I can prove it to you.- Ghost said.

Ghost turned intangible and passed through Velma.

-Wow.- Daphne Blake said.

-Okay, I'll believe you for now; But I won't give up! I'll find a rational explanation for this no matter what it takes.- Velma Dinkley said.

-Okay.- Amelia said.

The girls were a little uncomfortable.

-We can get back to business. Girls, listen up. Someone who calls himself the Master of Monsters has invaded your former teachers' village with an army of monsters.- Marcus said.

-Is that true?.- Winnie asked.

-Yes, it is.- Shaggy Rogers answered.

-I see why you came back.- Winnie said.

-Winnie thought that they had come back only because they needed her help and not because they wanted to see you.

-Yes, but I'm also glad to see you.- Shaggy Rogers said.

-Uh-huh.- Winnie said.

-What do you say girls? Will you help us?.- Fred Jones asked.

-Would you do it for your former teachers?.- Scooby Doo asked.

-Of course we will help you. The Grimwood Ghoul Squad will not sit idly by if there is a madman out there leading an army of monsters.- Marcus answered.

-You two once saved us from an evil witch. Now it's our turn to return the favor.- Sibella said.

-Sibella.- Shaggy Rogers said.

-What a good girl you are.- Scooby Doo said.

Shaggy and Scooby were touched. Their former students still had a lot of affection for them.

-I'll do it because there are people who need us, not because of you two.- Winnie said.

Winnie didn't have much affection for them.

-It will be a perfect opportunity to spend quality time together.- Tanis said.

-They will be surprised to see what we are capable of.- Elsa said.

-We are no longer the same girls they had to save.- Ghost said.

-I don't know them but I am also part of the squad. So I will go.- Amelia said.

-I'm going too. I'm her teacher after all.- Marcus said.

-It's decided. Let's all get on the Mystery Machine.- Marcus said.

-The what?.- Marcus asked.

Marcus and the girls looked at the van that their former teachers came in.

-I like it, it's cute.- Tanis said.

-Whose is it?.- Amelia asked.

-Mine, I drove it.- Fred Jones answered.

-Oh, it's just that because of the color and the pattern of the flowers I thought one of your friends was driving it.- Amelia said.

-What? No, I drove it.- Fred Jones said.

-A little effeminate don't you think?.-Winnie asked.

-Not at all. She's completely masculine.- Fred Jones answered.

-If you say so.- Elsa said.

The girls thought Fred had girlish tastes. He disagreed with them.

-Well, what are we waiting for? Let's all get on.- Daphne Blake said.

The gang and the girls started to get on the mystery machine.

-Wouldn't it be better if...- Marcus didn't finish the sentence.

-Wait teacher. Don't ask Mr. Alador to teleport us. A road trip is what we need to reconnect with Shaggy and Scooby.- Sibella said.

-Please.- Ghost said.

-Okay. A road trip would do us good.- Marcus said.

-Thank you teacher.- Sibella said.

The girls and the gang were already inside the mystery machine. The Grimwood girls were in the back with their old teachers and Fred, Daphne and Velma were in front.

-I'll bring you back before the summer ends Miss Grimwood.- Marcus said.

-Okay. Have fun.- Miss Grimwood said.

-See you later Miss Grimwood.- The Grimwood girls said.

Miss Grimwood said goodbye to her students. Marcus headed to the Mystery Machine.

-I'm calling for it.- Marcus said.

Marcus climbed into the front seat. Fred started the engine.

-Crystal Cave is holding on. Mystery to the Order is already on its way.- Fred Jones said.

-With help from the Grimwood Ghoul Squad.- Ghost said.

-No one will stop us.- Winnie said.

-The Monster Master won't know what hit him.- Marcus said.

The Mystery Machine sped off towards Crystal Cave. The two teams are unique in saving a town from a villain. What adventures await Scooby and the Grimwood Ghoul Squad? Read on to find out.