As this fan fiction website won't let me have crossovers of more than two shows, I chose the two that I found the quickest. This crossover is about The Amazing World of Gumball, Regular Show, and Johnny Test, all of my fave CN shows. Not Adventure Time. Don't like it. Now please, Adventure Time fans, please don't comment saying how crazy I am for not liking the show.
"I'm soooooo bored!" moaned an eleven-year-old flame-headed kid called Johnny Test as he bounced a ping-pong ball. His talking dog Dukey was resting next to Johnny's bed.
"It is a shame that your sisters won't let us into your lab..." Dukey replied.
Johnny laughed at the memory of how he and Dukey had pressed a button that was labelled JOHNNY DON'T PRESS THIS BUTTON which caused the house's roof to explode.
"We've got to find out what Susan and Mary are making! I know it's got to be awesome because everything they make is awesome and with all of their other inventions they don't lock me out because the house explodes as somehow it's always rebuild and..." Johnny started, but his face began going purple, so Dukey shook him and interrupted Johnny's incredibly long sentence.
Dukey made sure that Johnny had regained his breath before saying: "I think what you're trying to say, Johnny is... TO THE LAB!"
"How's it going, Gumball? Over." Darwin spoke into his walkie-talkie while holding onto a rope that was tied to his best friend Gumball.
"Fine. Lower it down more, Darwin. Over." Gumball replied.
Gumball was hanging in midair over their sleeping pink-rabbit father, who was drooling like usual, and holding a slice of pizza in his hand. It was all that was left of the most important relic in the world which Gumball and Darwin had ordered from the internet: The World's Biggest Pizza.
Darwin began lowering Gumball some more.
"Careful! We don't want to land on him! Over." Gumball said.
"Here? Over."
"Perfect! Now let go of your walkie-talkie and pick up the metal disk!" Gumball explained.
Darwin did as instructed and threw a metal disk down to Gumball. It landed on his head and nearly bounced into their father's wide-open mouth, but Gumball caught it.
"Maybe a little less close, next time, Darwin? Over."
Gumball placed the metal disk deep inside the slice of pizza.
"Okay, Darwin. Up we go! Over." Gumball said.
Darwin began pulling Gumball up until he was standing next to him on top of the wardrobe by the sofa their father was sleeping on.
"Do you have the magnet?" Gumball asked.
"Check!" Darwin replied.
"Help me attach it to the rope and prepare for lowering." Gumball said.
The two friends lowered the magnet, which picked up the metal disk along with the pizza, and soon, Gumball and Darwin were munching away at a slice of The World's Biggest Pizza. They're mother had cooked a bigger one, so it was a bit of a rip-off.
Mordecai and Rigby slowly sulked over to the garage. It was once again their job to do the most boring thing of the preparation of Benson's birthday party.
"You know, Mordecai, I'm starting to think that nobody trusts us around here." Rigby said.
"You think?" Mordecai grumbled. "Everything we do is either set up the chairs and tables or drive a bus... and we can't even do that without unleashing the Destroyer of Worlds or Night Owl!"
"You saying that we're not very reliable?" Rigby asked.
"What do you think, Rigby?" Mordecai asked.
The two friends opened the door into the chair room and sat down.
"Hey, well at least the Destroy of Worlds' game console has been destroyed." Rigby said.
"Night Owl's still out there." Mordecai replied. "Anyway, let's get back to work, because we don't want to get fired or just shouted at by Benson."
But Rigby had disappeared.
"Rigby?" Mordecai asked. "Where are you Rigby?"
"Over here!"
Mordecai walked over to his friend who was standing by a large object covered by a white mattress. There was a piece of paper with writing on it. Mordecai picked it up and read out loud: "Mordecai and Rigby, please press the big red button on this device. Signed by Bensom."
"Bensom?" Rigby asked. "All of a sudden, Benson can't spell his own name anymore?"
"I'm getting a bad feeling about this, Rigby. Whatever you do, don't -"
But Rigby had removed the mattress to reveal a huge device with a pointy camera aiming at the two friends. Before Mordecai could stop him, Rigby pressed the red button, and then, a red beam zapped them both, and everything went black.
Johnny Test and Dukey crawled through the air vents above his sister's lab. Through the slits in the metal Johnny could see that his sisters were building some sort of projector.
"Cool. Please make it send us to some other dimension. Please make it send us to some other dimension." Johnny whispered.
"Careful what you wish for, Johnny. It might send us to a world full of dinosaurs and robotic owls that all they want to do is kill us." Dukey said.
"I doubt it. Susan and Mary don't do stuff that dangerous." Johnny said.
"Because out of all the experience we've had, you still believe that." Dukey replied.
"You're so paranoid, Dukey. I bet that right now you're thinking that Susan and Mary are going to shoot us out of the air vents!" Johnny quietly laughed.
Blam! A green laser beam struck the air vents and Johnny and Dukey fell to the floor of the lab. Mary was holding the blaster that had shot Johnny and Dukey. Susan was holding a Johnny Coupon.
"It's about time, little brother. Here, we still have one Johnny Coupon left for a free experiment!" Susan said.
"So we're going to send you to a dimension full of dinosaurs and robotic owls!" Mary said.
"Great..." Johnny said.
"We're just joking, Johnny. We just want you to come in and out of our new portal. It's supposed to send into the future or into an alternate present." Susan explained.
Before Johnny could protest, Mary had pressed the button and a portal opened. Immediately it began sucking everything into it. Johnny, Dukey, Susan, and Mary had to hold on to the walls to avoid being sucked inside.
"Is that supposed to happen?" Dukey asked.
"No!" Mary screamed as she and Susan were sucked inside.
"Susan! Mary!" Johnny called out to them, and then turned to Dukey. "Come on, dog, we have to get them back."
"I'm not sure that's such a good idea -" Dukey began, but Johnny had grabbed him and they whirled into the portal.
After finishing the slice of The World's Biggest Pizza, Gumball and Darwin climbed down from the wardrobe just when the doorbell rung. Their father sprang up immediately shouting "I'VE GOT IT!" before discovering that his pizza had been stolen. But it didn't stop him from running to the door and retrieving the small package from their postman.
"What is it, Mr Dad?" Darwin asked.
"You'll see when I open it." Richard, their Dad, said. "And is it me or did the postman look very reptile-ish today? Oh well!"
Richard began tearing at the package and revealed a jar of radiating-green jelly.
"Are you sure that's safe to eat, Dad?" Gumball asked, revolted.
"Of course!" Richard grumbled, not noticing the ticket that said that the jelly had expired in 1798.
Richard took it over to the fridge and shoved it inside. Just then, the fridge exploded into a giant portal, sucking Gumball and Darwin inside.
"Children!" Richard shouted, but the portal closed. His sons and the fridge had disappeared.
"No!" Richard shouted at the world. "I was reserving a precious chicken leg in there!"
And Richard wept for the rest of the minute, before remembering that he had a chocolate bar hidden in his bedroom wardrobe.