The group was heading in the Mystery Machine to Crystal Cave. The girls were telling all the adventures they lived to their old teachers.

-And that's how we saved the world.- Sibella said.

-Snails. All that happened when we left?.- Shaggy Rogers asked.

-Yeah. You missed it.- Sibella answered.

-You missed a lot of things.- Ghost said.

-Wow, we didn't miss it, right Scooby?.- Shaggy Rogers asked.

-What a pity.- Scooby Doo said.

-It's good that Scooby and I left just in time.- Shaggy Rogers' thoughts.

-And what about you?.- Elsa asked.

-I'm sure you have a lot to tell us.- Tanis said.

-Ah, it's not that big of a deal. We just solve mysteries.- Shaggy Rogers said.

-The simple life of mystery solvers.- Said Scooby Doo.

-Scooby, me and the gang travel to all kinds of scary places solving mysteries and facing monsters.- Said Shaggy Rogers.

-It's our daily routine.- Said Scooby Doo.

-Have you also fought monsters like us?.- Asked Sibella.

-Well...when we caught them we found out that they're not really real monsters. Just masked cretins or real estate agents.- Answered Shaggy Rogers.

-Nothing compared to what you've done.- Said Scooby Doo.

-Are you kidding? You're great too.- Said Tanis.

-You unmask the imposters who pretend to be monsters. Those fakers ruin our reputation but you find out. You're heroes.- Said Sibella.

-I've never seen it that way.- Said Shaggy Rogers.

-No, never.- Scooby Doo said.

-How many have they unmasked?.- Elsa asked.

-We never kept count. There were so many.- Shaggy Rogers answered.

-More than we would like.- Scooby Doo said.

Marcus watched from the front as his students chatted with Shaggy and Scooby.

-They look like they're having fun in the back.- Fred Jones said.

-It's been a long time since we've seen each other. They're happy to see each other. I didn't know they missed each other so much?.- Marcus asked.

-It's weird to see Shaggy and Scooby so calmly chatting with monsters.- Daphne Blake said.

-Why do you say that?.- Marcus asked.

-Well it's just that...- Daphne didn't finish her sentence.

-What Daphne is trying to say is that Shaggy and Scooby are terrified of monsters.- Velma Dinkley answered.

-Well, I figured that. I was told that they ran away when they quit. Grimwood can be a little creepy.- Marcus said.

-It's not just real monsters that scare them. Fake monsters too, talking about monsters, places where you can see monsters and anything scary.- Velma Dinkley said.

-In short, they're chickens.- Velma Dinkley said.

-Chickens?.- Marcus asked.

Marcus couldn't believe that the dog and the boy who had saved his students were chickens.

-But they saved my students from an evil witch.- Marcus said.

-I don't know how that happened but believe me. I'm sure that in the end your students were the ones who saved them.- Velma Dinkley said.

-Are you serious?.- Marcus asked.

Marcus turned to look at Shaggy and Scooby.

-Seriously those two are chickens?.- Marcus' thoughts.

Marcus also saw Winnie. She wasn't talking to her old teachers. She was sitting on one side, arms crossed.

-Winnie, don't you have something to say to your old teachers? After all, you haven't seen them for a long time.- Marcus said.

-Yes, Winnie. Do you have something to tell us?.- Shaggy Rogers asked.

-What's up?.- Scooby Doo asked.

-Yes. Where's Coach Scrappy?. Couldn't he come or didn't want to?.- Winnie asked.

The gang fell silent when they heard that question. Marcus noticed that they made an awkward silence.

-What?.- Marcus asked.

-I'm afraid you won't be able to see Coach Scrappy anymore.- Shaggy Rogers answered.

-It's a sad story.- Scooby Doo said.

-Oh my God. Is he dead?.- Sibella asked.

. It's not that.- Shaggy Rogers replied.

-So what is it?.- Elsa asked.

-It's complicated.- Shaggy Rogers replied.

-Complicated.- Said Scooby Doo.

-He turned bad and wanted to take over the world.- Said Fred Jones.

Everyone was silent at what Fred said.

-What? That's what happened.- Said Fred Jones.

Daphne hits Fred for being a fool.

-Ouch.- Said Fred.

-You really have no tact, do you Fred?.- Asked Velma Dinkley.

-Is that true?.- Asked Tanis.

-I'm afraid it is. He wanted to take over the world and we had to stop him.- Said Shaggy Rogers.

-He tried to kill us too.- Scooby Doo said.

The girls couldn't believe it. The adorable little dog who trained them, rescued them, and had made friends with Matches. He had become a villain.

-I don't believe it. Coach Scrappy wasn't that kind of person.- Ghost said.

-How did that happen?.- Elsa asked.

-Where is he now?.- Sibella asked.

-He's in jail.- Shaggy Rogers answered.

-Sometimes we visit him to bring him food.- Scooby Doo said.

-Even though he tried to kill us, he was our friend.- Shaggy Rogers said.

-Wow, incredible. Sometimes you don't realize what people are really like.- Winnie said.

Winnie looked at Shaggy and Scooby.

-But why? Why did Coach Scrappy do that?.- Tanis asked.

-Attention. He did it for attention. He didn't get enough attention.- Fred Jones replied.

-I think it was because he felt unloved.- Daphne Blake said.

-My heart breaks hearing that.- Sibella said.

Sibella touches her chest.

-I hope deep down, Coach Scrappy is still the same person we met.- Tanis said.

-Yeah, let's hope.- Scooby Doo said.

The girls and the Mystery to Order gang were hoping that one day Scrappy would be the brave little dog they knew again (We all know Scrappy is never coming back).

-Hey. Cheer up girls. I'm sure Scrappy will one day...- Marcus couldn't finish the sentence.

Fred, stop the truck suddenly.

-What's wrong? Why are you stopping like that?.- Marcus asked.

-The road is blocked.- Fred Jones replied.

Fred points to the front. There were two monsters patrolling the road to Crystal Cave, they were a mummy and a werewolf. They put up barriers to stop people from getting through.

-There are two monsters blocking the way.- Fred Jones said.

-And they don't look very friendly.- Daphne Blake said.

-What are we going to do?.- Shaggy Rogers asked.

Shaggy and Scooby were shaking.

-You guys are still the same as always. No way, leave Tanis and me to it.- Winnie said.

-We'll take care of it.- Tanis said.

-What are you going to do?.- Amelia asked.

-We'll go out and talk to them.- Winnie answered.

-Winnie, I don't think that's a good idea.- Marcus said.

-Relax. We know what we're doing.- Winnie said.

-They are a wolf and a mummy. We are a mummy and a wolf. We will surely understand each other.- Tanis said.

-We are counting on you.- Shaggy Rogers said.

-Good luck.- Scooby Doo said.

-Are you going to let them go alone?.- Marcus asked.

-Scooby and I would only get in the way.- Shaggy Rogers answered.

-We don't want to get in the way.- Scooby Doo said.

-It would be better if I went with you.- Marcus said.

Marcus wanted to accompany them but Velma stopped him.

-Wait Marcus. Look at that beech sign.- Velma Dinkley said.

Velma pointed to a sign that said: "Welcome to Crystal Cave. No humans."

-I think we should let them go.- Velma Dinkley said.

-Don't worry, master. We'll be fine.- Tanis said.

-Leave it in our hands.- Winnie said.

-Okay, but be careful.- Marcus said.

Winnie and Tanis got out of the truck. They went to talk to the werewolf and the mummy who were guarding the road. They saw them approaching.

-Stop right there! The road to Crystal Cave is closed.- The werewolf said.

-Go back where you came from.- The mummy said.

-Calm down guys. We are monsters just like you.- Winnie said.

-What are you doing?.- Tanis asked.

-We were ordered to make sure that no one enters Crystal Cave.- The mummy answered.

-Hey. I've never seen you before.- The werewolf said.

-Now that I see you, I've never seen you either. What are your names, agents?.- The werewolf asked.

-"Agents"?.- Tanis asked.

-We don't know what you're talking about.- Winnie said.

The werewolf and the mummy looked at each other.

-They're not agents?.- Asked the mummy.

-Then they're intruders! I didn't let them go.- Said the werewolf.

The werewolf and the mummy became hostile. Those who were in the Mystery Machine saw what was happening.

-I knew it was a bad idea. No way. Now they'll have to deal with it themselves.- Said Marcus.

-Aren't you going to help them? They're your students.- Said Velma.

-No, they can handle those guys.- Said Marcus.

-It'll be a piece of cake for them.- Said Sibella.

The werewolf and the mummy approached Winnie, and Tanis but they weren't scared.

-Oh, that's bad and I wanted to handle this peacefully.- Said Winnie.

-Can't we talk about it?.- Asked Tanis.

The werewolf and the mummy didn't answer him.

-No way. Let's do this, Winnie.- Tanis said

-I don't understand how there are people who don't value their health?.- Winnie wondered.

-TRANSFORMATION!.- The two screamed.

A light of energy surrounded their bodies turning them into their heroine forms.

The werewolf and the mummy covered their eyes from the brightness of the transformation. When they opened them, they saw the girls.

-But what the...? They've changed.- The werewolf said.

-What are you?.- The mummy asked.

The Mystery to Order gang watched in amazement from the Mystery Machine.

-They transformed. They literally transformed.- Velma Dinkley said.

-See? I told you. It's what my students do.- Marcus said.

-Did you see that, Scooby?.- Shaggy Rogers asked.

-Yes. I saw it.- Scooby Doo answered.

-If they know what's good for them? Let's go through.- Winnie said.

-Don't think so much of yourself, brat.- The werewolf said.

The werewolf approaches to attack Winnie. She hits him in the stomach, knocking him out. Then, Tanis wraps the mummy with his bandages and sends him flying away. They were no match for them.

-It's all clear now.- Tanis said.

-They weren't strong.- Tanis said.

Winnie and Tanis begin to remove the barriers.

-Was that Winnie and Tanis or did you imagine it?.- Shaggy Rogers asked.

-No. You didn't imagine it. Those were the Winnie and Tanis you already know.- Amelia answered.

-Surprised, right? That's because they haven't seen my transformation yet.- Sibella said.

-They won't have words, when they see my transformation.- Ghost said.

-My transformation is the coolest of all.- Elsa said.

-What?!. My transformation is the best of all!.- Ghost said.

-Shaggy. You have to see my transformation first.- Sibella said.

-No!, see mine first!.- Elsa said.

The three of them argued over who was going to show their transformation to their former teachers first.

-Girls, please. You'll have plenty of time to show them your transformations when you save our town.- Daphne Blake said.

-Of course. That will be the perfect time.- Sibella said.

-Don't take your eyes off us.- Ghost said.

-We'll surprise you.- Elsa said.

Winnie and Tanis finished removing the barriers and returned to their normal forms. They got into the truck.

-That's it. Start it.- Winnie said.

Fred accelerated towards Crystal Cave. They followed the road for a while until they could see the town.

-Snails.- Shaggy Rogers said.

-Look at that, friends.- Fred Jones said.

The place looked like pandemonium. There were monsters everywhere, the buildings were closed, the people on the street were being enslaved by the monsters. The gang looked horrified at what their home had become. Marcus was furious at seeing that.

-That Monster Master is a tyrant.- Marcus said.

-How can they treat humans like that?.- Sibella asked.

The girls knew there were monsters who didn't like humans but what they saw was too much.

-Where did so many monsters come from?.- Amelia asked.

-I don't know but there's something strange about those monsters. I smell it in my nose.- Winnie answered.

Winnie sniffed them and perceived a strange aroma in those monsters.

-Do you think they're all guys in costumes?.- Velma Dinkley asked.

-No. The monsters we encountered earlier were real, these must be too.- Tanis answered.

-How are we going to fight so many?.- Elsa asked.

-We need a plan.- Marcus said.

-You're lucky because making plans is what we do. For now we'll make sure we're not detected and then...- Fred Jones couldn't finish his sentence.

Before Fred could tell them his plan, some vampires jumped on top of the Mystery Machine.

-AAAHHH!.- Everyone screamed in terror.

The vampires tried to get into the Mystery Machine.

-Lose them Fred!.- Daphne Blake said.

Fred stepped on the accelerator and started driving to lose the vampires. They held on tightly to the Mystery Machine, Fred made several maneuvers to make them fall but they were tightly held with his claws.

-Get your claws off my truck!.- Fred Jones said.

-This is bad.- Marcus said.

-Relax, I can take it to the shop later to get the scratches removed.- Fred Jones said.

-I mean, if we keep going like this, we're going to get the attention of the other monsters.- Marcus said.

-Think of a plan, blond boy!.- Winnie said.

-Don't worry. I may not have superpowers like you, but if there's one thing I'm good at, it's cheating.- Fred Jones said.

Fred pressed a button on the driver's seat. Flares came out of the Mystery Machine from the outside, mowing down one of the vampires, causing it to fall.

-One goes, two to go.- Fred Jones said.

Fred pressed another button on the driver's seat. Smoke began to come out of the outside of the Mystery Machine. That smoke was garlic. One of the vampires smelled it, made a disgusted face, let go of the truck and crashed into a pole.

-Two there, one to go.- Fred Jones said.

Sibella covered her nose because of the smell of garlic.

-Was that garlic? Why did you have that?.- Sibella asked.

-You never know when you'll be attacked by vampires. No offense.- Fred Jones replied.

Sibella was a little upset.

-This will get rid of the last one.- Fred Jones said.

Fred was about to press another button but Sibella stopped him.

-Wait. I'll take care of this.- Sibella said.

Sibella approached the window.

-Open the window.- Marcus said.

Marcus opens the window for her, she turns into a bat and flies to the top of the truck. Once on top, she returns to her normal form and stands on top of the truck.

-Hey, vampire man! Come for me!.- Sibella called.

The vampire stands on top of the truck.

-Kick his ass!.- Daphne Blake said.

-Isn't it dangerous for a girl to be standing there?.- Velma Dinkley asked.

-No. She has everything under control.- Ghost answered.

Sibella prepared to transform.

-TRANSFORMATION!.- Sibella shouted.

A light of energy surrounded her body turning her into her heroine form. Sibella got into a guard position, the vampire growls and goes to attack her. She punches him in the face, then a roundhouse kick with her heel and a sweep with her feet. The vampire on the ground grabs Sibella by the feet and throws her out of the van but she flies away with her bat wings. Sibella starts to fly through the air, the vampire chases her. She soars high and then descends at full speed in position to kick, she connects a powerful kick to the vampire's stomach causing him to fall to the ground. Sibella gets back on top of the Mystery Machine.

Fred stops the van.

-That was amazing.- Fred Jones said.

-Look!. There are more coming!.- Marcus said.

More vampires were flying towards them. Shaggy and Scooby were scared.

-Now what do we do!?.- Shaggy Rogers asked.

-Calm down. I'll take care of it.- Sibella said.

The vampires were getting closer but Sibella was ready for them.

-SUMMONING!. BATS TO ME!.- Sibella screamed.

Sibella summons a swarm of bats to cover the Mystery Machine, when the bats leave, the van was gone.

Marcus, the Grimwood girls and the gang had escaped to an alley away from the vampires.

-Very well done, Sibella.- Marcus said.

-Thank you master.- Sibella said.

Sibella returns to her normal form and enters the Mystery Machine.

-There are monsters everywhere. We need a hiding place.- Shaggy Rogers said.

-Yes, a hiding place.- Scooby Doo said.

-I know just the place.- Fred Jones said.

The group hid in an abandoned pizzeria, there were boards nailed to the windows, the place was in disarray from the attack.

-A pizzeria is your hiding place, Fred?.- Velma Dinkley asked.

-I have to admit it Fred. It's a very good hiding place.- Shaggy Rogers said.

-Good thinking.- Said Scooby Doo.

-Not only do we have somewhere to hide, we also have a place to eat.- Said Shaggy Rogers.

-I'm starving.- Said Scooby Doo.

-Let's see what's there to eat in the kitchen, Scooby.- Said Shaggy Rogers.

Shaggy and Scooby went to the kitchen to get food, the rest stayed to think of a plan.

-What are we going to do now?.- Asked Sibella.

-First we have to find out what these monsters are hiding.- Answered Velma Dinkley.

Velma took out a piece of vampire hair from her pocket that she had taken earlier.

-What is that?.- Asked Winnie.

-It's hair from those vampires from before. I want to analyze it to know what they really are.- Answered Velma Dinkley.

-You still don't believe in monsters?.- Asked Marcus.

-Of course not, behind every supernatural event there is a scientific explanation.- Velma Dinkley answered.

-And what scientific explanation do you have for us?.- Tanis asked.

-I don't know that yet but I'm going to find out. Science and reasoning will prevail.- Velma Dinkley answered.

Elsa looked out a hole in the window.

-There are many monsters out there.- Elsa said.

-There may be people who need our help.- Ghost said.

Fred, Daphne and Velma thought about their families. They still didn't know what had happened to them.

-We have to find our families.- Daphne Blake said.

-Who knows where they could be?.- Fred Jones asked.

-We must also find the Master of the Monsters and stop him.- Marcus said.

-But we don't know where he is.- Amelia said.

-Well then we'll look for him.- Marcus said.

-There's a lot to do.- Amelia said.

-You solve mysteries, right? How do you do it?.- Sibella asked.

-Well Sibella, usually the first thing we do is split up and look for clues.- Daphne Blake answered.

-What a great idea Daphne, that's exactly what we have to do.- Fred Jones said.

Shaggy and Scooby come back from the kitchen.

-Bad news, friends.- Shaggy Rogers said.

-There's no more food left.- Scooby Doo said.

-Not a crumb, we've already looked everywhere.- Shaggy Rogers said.

-It's good that you're back, we already have a plan.- Fred Jones said.

-Are you sure it's a good plan?.- Marcus asked.

-Of course. We've been doing this for a long time.- Fred Jones answered.

-Ah, you're the ones with the mysteries.- Marcus said.

-We'll split up and look for clues.- Fred Jones said.

-I want to analyze this sample I took. I know the right place to do it but I'll need someone to go with me.- Velma Dinkley said.

-I can go with you.- Marcus said.

-Great. Velma will go with Marcus.- Fred Jones said.

-We have to know what happened to all the people.- Daphne Blake said.

-And by the way, look for our families.- Fred Jones said.

-I'll go with you.- Amelia said.

-You're the undead girl, right?.- Fred Jones asked.

-Yes. My dad taught me magic, I can be very useful.- Amelia answered.

-Good. Fred, me and Amelia will go together.- Daphne Blake said.

-That only leaves you 7.- Fred Jones said.

-Fantastic. Then we'll look for clues with our old teachers.- Sibella said.

-If there is no other way.- Winnie said.

-Please teach us everything there is to know about solving mysteries.- Ghost said.

-Sure, we will teach them everything they have to do when they look for clues.- Shaggy Rogers said.

-Which are running and hiding.- Scooby Doo said.

-Run and what?.- Tanis asked.

-No, nothing.- Shaggy Rogers answered.

-Take good care of my students.- Marcus said.

-Sure, you can count on us.- Shaggy Rogers said.

-They will protect us very well.- Scooby Doo said.

-What?.- Marcus asked.

-What Scooby said was that... we will protect them very well.- Shaggy Rogers answered.

-Ok. Girls, this is your chance to spend quality time with your former teachers.- Marcus said.

-It's what we're waiting for.- Elsa said.

-Alright, listen, this is the plan. Marcus and Velma will investigate those supposed monsters.- Fred Jones said.

-And the three of us will look for the people, right?.- Amelia asked.

-Exactly, we're counting on your help.- Daphne Blake answered.

-And what will we do?.- Shaggy Rogers asked.

-Your group will look for the Master of the Monsters.- Fred Jones answered.

Shaggy and Scooby were scared when they knew they had to do that.

-The Master of the Monsters?.- Shaggy Rogers asked.

-It's necessary to know his whereabouts.- Fred Jones answered.

-And if we look for the whereabouts of the food instead?.- Scooby Doo asked.

Winnie howls.

-Don't be afraid, we're going to protect you.- Winnie said.

-With us near you, no other monster will come close to you.- Sibella said.

-Well, I think we'll be safe by your side.- Shaggy Rogers said.

-You're in charge of looking for clues and we'll protect you.- Marcus said.

-It's decided. Attention gang and Grimwood Ghoul Squad, let's split up to look for clues and then save the town.- Fred Jones said.

-Yes!.- They all said.

They split up into groups of three and went to look for clues in Crystal Cave.