Peace had returned to the world. Now that the spider queen had been sealed, everyone was free to enjoy their lives. Marcus stayed in Grimwood. He would now be the gym teacher forever. The girls were no longer in danger and could enjoy their lives.

Summer vacation had begun. Marcus and Miss Grimwood spent it at Grimwood School to take care of her. The girls enjoyed their summer vacation at their parents' house. Everything was peaceful for them. What they didn't know was that a new enemy was about to appear.

In a town called "Crystal Cave" they were celebrating their 121st anniversary of harmony. Crystal Cave was the sunniest place in the world. At the festival there were food and game stands. There were also mechanical games. Some were dressed as animals selling balloons to children. Everyone was having fun. They were happy. Because Crystal Cave was one of the best places in the world.

On a platform that was located in the square. The mayor was about to make an announcement. The mayor was a 30-year-old adult woman with long dark red hair that curled at the ends. She was of medium height and had a dimple on her chin. She was wearing a red dress with light blue and white trim on the front, collar, and cuffs; she also had pockets on each side of the front of her dress. She was wearing light blue tights and red shoes with red bows.

People were gathering to listen to her.

"Hello Crystal Cave. I'm your mayor Janet Nettles. Hello dear," Janet Nettles said.

She was greeting her husband who was standing with her children in the crowd. Her husband was Sheriff Bronson Stone, the town's police officer. He was a tall middle-aged man with shaved hair, a mustache, broad shoulders, and a wide jaw. His hair was brown, but gray was visible at the front and temples. He was wearing a sheriff's uniform, with dark brown pants and a gold star-shaped sheriff's badge. His boots were brown, a brown tie and a brown western-style hat.

"Hello honey. Say hello to your mother, children," said Sheriff Bronson Stone.

He and his four children waved to the mayor.

"Welcome everyone to this festival we like to call "I love Crystal Cave," said Janet Nettles.

"I love Crystal Cave," said the crowd.

-Today, approximately 121 years ago our ancestors came to this land and founded our beloved town. If they could see us now they would be happy with what we have made it. Crystal Cave has been named the sunniest place in the world. And why has it been called that? It's not because of our climate. It's because the smiles of all our happy citizens shine like a ray of sunshine.- Said Janet Nettles.

-Well said, honey! She's my wife.- Said Sheriff Bronson Stone.

-So, now you know. Celebrate. Eat and be happy. Nothing can go wrong in Crystal Cave.- Said Janet Nettles.

Suddenly the sun went down. Something was blocking it. When the citizens raised their heads to see what it was, they saw that it was a giant blimp flying through the sky.

-Is it a new attraction?.- Asked Frederic Jones.

-I didn't know we would have giant blimps this year.- Said Angie Dinkley.

From the giant airship, a group of bat monsters began to descend. They were the size of an adult and had black fur. They flew straight towards the crowd. People panicked.

-Oh, my God.- Janet Nettles said.

-Everyone, run!- Sheriff Bronson Stone shouted.

People began to flee in panic from the giant bats. Suddenly, an army of mummies and zombies emerged from the ground, blocking the way out for the people.

-Stay back, my children. If you touch my children, you'll have to deal with me, you monstrosity.- Sheriff Bronson Stone said.

The sheriff tried to protect his children. A howl was heard. An army of werewolves approached. Then an army of ghosts appeared. They began to destroy the town, causing havoc and scaring people. The citizens fled for their lives.

-Holy crap. The town has become a pandemonium.- Frederic Jones said.

-This doesn't happen in Crystal Cave. Maybe in Chicago, but not in Crystal Cave.- Paula Rogers said.

-Who would do something like this?.- Brad Chiles asked.

A rope fell from the airship. From that rope, a man descended. He wore a gray and black robotic suit. He wore a glass helmet that blocked the view of his face. His left arm was missing. Next to that man, three monsters descended. One was a werewolf, robust and short, his fur was brown. The other was a vampire monster, his body was thin and his skin was gray. The third was a large and muscular Frankenstein. His skin was green, he wore clothes only on the bottom part. His left arm was a hammer, he had screws instead of ears and his face was horrible. He wore brown pants and black boots. The four of them descended to the platform. The man with the helmet stood in front of the crowd, took out a microphone from his suit and began to speak.

-I present myself before you. I am the master of the monsters. These three that accompany me are my henchmen. The furry one is agent 2. The bat is agent 1 and this big boy that you see here is Franace.- Said the master of the monsters.

-What do you want?.- Asked Janet Nettles.

-"What do I want"?. What every man wants more than anything else. I WANT REVENGE!.- Answered the master of the monsters.

-I don't remember that this town has caused you any harm.- Said Sheriff Bronson Stone.

-Hahaha. My revenge is not against this mediocre town. You are only a means to an end. My revenge is against those two who ruined my evil plans.- Said the master of the monsters.

-What are you going to do with us?.- Asked Paula Rogers.

-You don't have to know now. I want it to be a surprise. Monsters! At them!.- Said the master of the monsters.

The master of the monsters ordered his army to subdue the people. They ran in terror as the monsters chased them. One by one, they were being caught.

-Come to me. First I will destroy your home and then I will destroy you. Thus, revenge will be mine. Hahahahaha!.- Said the master of the monsters.

The master of the monsters laughed as his army took over Crystal Cave.

In another place. In a mansion far from where Crystal Cave was located. There was a man with his robot butler, watching what was happening in Crystal Cave on his huge computer. The man's appearance consisted of long, gray hair tied in a ponytail and a gray goatee. His clothing consisted of a white robe with an orange shirt inside, brown pants, black shoes, and brown glasses. The robot was black, white, and gray with a red bow and brown crests and mouth. His black torso imitated a suit. He had three wheels to move. The two were in a secret laboratory that was located under the mansion where they lived.

-This is bad Robi.- The Man said.

-What are we going to do Uncle Albert?.- Robi asked.

-I only know a group of people who specialize in things like this. We have to call Mystery to the Order.- Albert answered.

At Miskatonic University. A history class was being held in room 101. The class was taught by Professor John Dewey.

-Let's see class. Who can answer this? Does anyone know what the word "Nibiru" means?.- John Dewey asked.

His students were thinking about the answer but none of them had answered yet.

-How are you Mr. Rogers? Can you answer this question?.- asked John Dewey.

The teacher asked his student Shaggy Rogers. He was an 18 year old boy. The boy had a huge neck, a skinny and rather long body, and his hair was mustard-colored. He was wearing a green shirt, brown pants, and black shoes.

-Nibiru? No, that's a word I hope I'll never hear again in my life.- said Shaggy.

Hearing that word scared Shaggy (You know why).

-Let's move on to someone else. Fred Jones, answer the question.- said John Dewey.

The teacher asked his student Fred Jones. He was an 18 year old boy. His hair was blond. He wore a white sweater over a blue shirt, his pants were blue, and he wore an orange scarf. He didn't listen to the teacher, he was busy writing in his notebook.

-Fred Jones!.- Professor John Dewey called him.

-What?. Oh, I'm sorry teacher. I didn't hear you. I was busy designing a trap.- Said Fred Jones.

-You and your traps. Better forget it.- Said John Dewey.

The professor decided to ask another student.

-Daphne Blake. Answer the question.- Said John Dewey.

The professor asked his student Daphne Blake. She was a young woman of 18 years old. Her figure was like an hourglass and she had red hair that reached her shoulders. She was wearing a purple blouse, a dress, pink stockings and purple shoes. She was also wearing a purple plastic headband and a green scarf.

-I know the answer to your question but I'm afraid to say it.- Said Daphne Blake.

-What?. Why?.- Asked John Dewey.

-It's just that...well...it's something that happened in the other timeline.- Answered Daphne Blake.

-What the hell are you talking about? Can't anyone answer my question? - John Dewey asked.

A student raised her hand.

-Let's see Velma Dinkley. Can you answer this question once and for all? - John Dewey asked.

The teacher asked his student Velma Dinkley. She was an 18 year old girl. She had chin-length reddish brown hair and freckles. She was wearing a loose, thick orange sweater with a high collar, a red skirt, orange knee-high socks and black Mary Jane shoes.

-It's an Aztec word that means "End of the World." - Velma Dinkley answered.

-Finally. Excellent answer Mrs. Dinkley.- said John Dewey.

A dog that was sitting in the classroom got upset when he heard the word "End of the world". The dog's breed was a Great Dane, his fur was brown from head to toe with several distinctive black spots on the upper part of the body.

-What!? End of the world!? Again!?.- asked the dog.

He but hid under his seat trembling. Everyone saw how ridiculous it was.

-Calm down Scooby doo. It's not the end of the world.- said Shaggy Rogers.

-It's not? What a relief.- said Scooby doo.

Scooby, got out of his seat.

-If you're done I'd like to continue, if you don't mind.- said John Dewey.

Scooby smiled at the teacher.

-So what has become of my life? Here teaching a dog a history lesson. Why do they allow this dog to enter the classroom?.- John Dewey asked.

- Teacher Dewey, Scooby, me and my friends were recommended to enter by Professor Harlan Ellison.- Shaggy answered.

- Yes, Professor Harlan recommended us.- Said Scooby doo.

- Oh, what is Professor Harlan thinking? Well, let's continue with the class. What else could happen?.- John Dewey asked.

Suddenly, Robi enters the classroom destroying the door of the room. Everyone looked at the robot that destroyed the entrance. Shaggy and Scooby knew who it was.

- Robi?.- Shaggy asked.

- What is it doing here?.- Scooby asked.

- What the heck is going on here? Now a robot? I don't remember that it is written in my contract that I have to teach a robot too.- John Dewey said.

Robi saw Shaggy and Scooby in their seats.

-Nephew Shaggy, Scooby roo. How long? (It's not a mistake. That's what Robi calls Scooby).- Robi said.

Robi approached Shaggy and Scooby. He went towards them at high speed. Scaring the other students. He stood on top of the table where Shaggy and Scooby were sitting.

-What are you doing here?.- Shaggy asked.

-Crystal Cave is in trouble. We must gather Mystery to the Order.- Robi answered.

The other three members of Mystery to the Order heard what Robi said.

-Crystal Cave is in trouble?.- Fred Jones asked.

Professor John Dewey called their attention.

-Do me a favor and get that junk out of my classroom.- John Dewey said.

-Junk? I'm a robot butler. Let me show you.- Robi said.

Robi took out several devices from his body. Shaggy stopped him so he wouldn't make a mess.

-Wait, Robi. We better go talk outside.- Shaggy said.

Shaggy and the rest of the Mystery to Order gang went outside to talk to Robi.

The Mystery to Order gang was in the university courtyard with Robi.

-What's the emergency?.- Shaggy asked.

-You said our home was in danger?.- Velma Dinkley asked.

-Indeed. The master of the monsters took over Crystal Cave.- Robi answered.

-Master of the monsters?.- Scooby doo asked.

Scooby and Shaggy freaked out when they heard that name.

-Who is that master of the monsters?.- Daphne Blake asked.

Robi opens a door on his chest and projects a video hologram of Uncle Albert.

-I'll answer that.- Albert said.

-Uncle Albert.- Scooby and Shaggy said.

-Is that your Uncle Albert? The one who left you that huge mansion?.- Fred Jones asked.

-Yes. Do you remember him Scooby?. When we were rich, we ate what we wanted and we had parties. Ah, those were the days.- Shaggy said.

-Good times.- Scooby said.

-And how did you lose it?.- Velma Dinkley asked.

-We made a bad investment.- Shaggy answered.

-We put all our money in.- Scooby Doo said.

-Luckily Uncle Albert bought us the mansion. Although I still think our investment could have worked.- Shaggy said.

-I don't know how you think investing in building houses made of chocolate could have worked?.- Albert asked.

-You would have a house and food at the same time.- Shaggy answered.

-It's every man's dream.- Scooby Doo said.

-No. Just yours.- Daphne Blake said.

-They also melt.- Velma Dinkley said.

-I didn't contact them to talk about that. Crystal Cave is in danger. Watch this.- Albert said.

Robi showed them images of their home being attacked by the Master of the Monsters and his army.

-Sparks. Is this real?.- Velma Dinkley asked.

-Unfortunately it is. You must save Crystal Cave.- Albert answered.

-But how are we going to stop an entire army of monsters?.- Shaggy asked.

-We usually face one at a time.- Scooby Doo said.

-We'll have to make a very big trap to catch all those monsters.- Fred Jones said.

-They won't do it alone, they'll have help from them.- Albert said.

Robi showed the Mystery to Order gang pictures of the Grimwood Ghoul Squad.

-Who are they?.- Velma Dinkley asked.

-I know them. They're that group of girls who saved a city from an army of spiders. It went viral on the internet.- Daphne Blake said.

-Was it real? I always thought it was a video with special effects. The idea that a group of heroes would save a city from an army of spiders is absurd.- Velma Dinkley said.

Scooby and Shaggy, seeing those girls, reminded them of something from their past.

-Hey Scooby. Don't those heroines look familiar to you?.- Shaggy asked.

-They look familiar to me.- Scooby Doo answered.

-They call themselves the Grimwood Ghoul Squad.- Albert said.

-What a name.- Fred Jones said.

-Someone should advise them to choose a better one.- Daphne Blake said.

Upon hearing the name "Grimwood", Shaggy and Scooby knew who those girls were.

-"Grimwood"? You don't think they are...?.- Shaggy Rogers didn't finish the sentence.

-That would be crazy.- Scooby Doo said.

-This is a picture of those girls in their true form.- Albert said.

Robi showed a picture of the Grimwood girls in their normal form. Shaggy and Scooby were surprised when they saw them. Their former students from the school where they worked had become heroes.

-Are they? But they're just kids.- Fred Jones said.

-With some terrible disguises I have to add. They don't fool anyone.- Velma Dinkley said.

-No, Velma. They are real monsters.- Albert said.

-Real monsters?.- Daphne Blake asked.

-Indeed. They study at a school for monsters called Grimwood.- Albert answered.

-"Grimwood"?. Aaaahhhhh, that's where its name comes from.- Fred Jones said.

-Are you trying to tell us that there is a school for monsters?. That's hard for me to believe.- Velma Dinkley said.

-If you don't believe me, then ask my nephew Shaggy and Scooby.- Albert said.

Fred, Daphne and Velma looked at Shaggy and Scooby. They seemed to be hiding something.

-Shaggy. Scooby.- Velma Dinkley said.

-Is there something you want to share with us?.- Fred Jones asked.

Shaggy and Scooby never told their friends about their experience at Grimwood. They wouldn't have believed them if they had told them and they didn't want them to know that monsters did exist.

-You see guys, there's something we haven't told you. About our job, when you were at summer camp.- Shaggy said.

-We were working at a school for monster girls.- Scooby Doo said.

-You guys worked at a school for monsters?.- Daphne Blake asked.

-Yeah. Scooby, me and Scrappy worked at a school for monster girls.- Shaggy answered.

-It was horrible.- Scooby Doo said.

-There was a vampire girl, a wolf girl, a mummy, a Frankenstein girl, a ghost, a dragon and a floating hand.- Shaggy Rogers said

-And an evil witch.- Scooby Doo said.

-Oh, right. That was the worst of it all.- Shaggy Rogers said.

Shaggy and Scooby shivered as they remembered their time in Grimwood. Fred walked over to Shaggy and Scooby.

-Shaggy. Scooby. I'm so upset that you kept this from me.- Fred Jones said.

Fred seemed upset.

-You should have told me that monsters existed! We could see real monsters being chased instead of guys in masks. Oh, the traps I would have made.- Fred Jones said.

Fred was excited by the idea that monsters existed. That's one of the other reasons why Shaggy and Scooby never told him.

- Oh, please Fred. You don't believe that all this is real. There's obviously a logical explanation for all this.- Velma Dinkley said.

Velma was a woman of science. She didn't believe in the existence of monsters.

- Seriously Velma. It was all real, we saw it.- Scooby Doo said.

Scooby covered his head with his paws and trembled remembering all those monsters.

- In the end Scooby and I did the most sensible thing. We didn't run away from there.- Shaggy Rogers said.

- Well now they'll have to go back there.- Albert said.

Shaggy and Scooby got upset when they heard that.

- Go back to Grimwood?.- Shaggy asked.

-That's right. They must return to Grimwood and ask for help from their former students.- Albert answered.

-How did you know we were teachers there?.- Shaggy asked.

-I know a lot about you, nephew.- Albert answered.

Uncle Albert said that and hung up.

-Good luck.- Robi said.

Robi wished them luck and left at full speed.

-Gang, it seems we have another mystery on our hands.- Fred Jones said.

-We must find out who this Master of Monsters is and save Crystal Cave, but first we must go to that supposed school of monsters.- Velma Dinkley said.

-So, where is Grimwood?.- Fred Jones asked.

-Shaggy and Scooby know. After all, they've been there before. Aren't they excited to see their former students again?.- Daphne Blake asked.

-Yeah, very excited. Right Scooby?.- Shaggy Rogers asked.

-I can't contain my excitement.- Scooby Doo replied.

Shaggy and Scooby pretended to be excited. In reality, Grimwood was a place they never expected to see again.

-It's decided. Grimwood, here we go.- Fred Jones said.

The Mystery to Order gang will head to Grimwood. Shaggy and Scooby's reunion with their former students is approaching.