This is my first Regular Show crossover. Enjoy. This is in script format because they are easier for me. Like it or not.
(Mordecai and Rigby were about to start eating a ten foot chilly dog.)
Mordecai Rigby: Ten foot chilly dog time! Whoo!!
Rigby: This makes me remember all the times exactly like this one.
Mordecai: I just hope Benson doesn't catch us.
(A storm started brewing)
Mordecai: Let's move Rigby. We don't want a soggy chilly dog.
(Mordecai and Rigby moved under a tree)
Mordecai: I hope Benson doesn't catch us.
Rigby: And if we get caught, we don't tell Benson we broke into the park's piggy bank to buy this chilly dog.
Mordecai: Right.
(Mordecai cut the chilly dog in half with a knife he'd borrowed (stolen!) from the kitchen)
Rigby: Let's dig in!
(Suddenly, lightning struck the tree that they were under)
Rigby: Holy crap!
(It kept on going but suddenly stopped)
Rigby: What was that?
Mordecai: I don't think it's something to worry about anymore.
(Suddenly, something fell on top of Rigby)
Rigby: Aahh!!!!! There's an alien on top of me!!! Save me Mordecai!!!
Mordecai: Dude, it's just a hedgehog.
(A hedgehog had fallen on top of Rigby. It quickly rolled off of him)
Rigby: I can breath.
(He stood up. He then noticed the hedgehog was blue)
Rigby: Are hedgehogs usually blue Mordecai?
Mordecai: No. And hedgehogs don't wear shoes either.
(This hedgehog was wearing red sneakers. He kept on staring at Mordecai and Rigby)
Rigby (whispering): Does he talk?
Mordecai (whispering): I'll find out.
(Mordecai faced the hedgehog)
Mordecai (slowly): Hey dude. Do you speak English?
(The hedgehog nodded)
Mordecai (slowly): Who are you?
Sonic: I'm Sonic. Sonic the Hedgehog.
(He looked around at his surroundings)
Sonic: Where am I?
Rigby: You're in the park stupid.
Mordecai: Rigby! He may not be from here!
Sonic: Exactly what he said. I'm not in the Green Hill Zone so that means I'm not from here.
Mordecai: Is the Green Hill Zone where you're from?
Sonic: Yeah.
(Sonic noticed the chilly dog)
Sonic: Is that a ten foot chilly dog?!
Rigby: Yeah. (I'm surprised he knew what that was)
Sonic: I love chilly dogs. They're my favourite. And a ten length one. That's a dream come true. Where'd you get it?
Rigby: You have to keep it secret if we tell you.
Sonic: I can do that.
(Rigby nodded)
Rigby: We used our boss's money that's supposed be for the park to buy this.
Mordecai: We got the chilly dog from the local sub store. They were avaliable for today only. Something to do with the chilly dog's official birthday.
Sonic: The chilly dog's official birthday?! How could I not remember it? I'm such an idiot.
???: Mordecai! Rigby!
(Mordecai and Rigby's boss Benson was storming over to them. He was holding the park's piggy bank (which was shattered into pieces because Mordecai and Rigby smashed it with the park's sledgehammer) and was red in the face)
Benson: Why is the piggie bank shattered?!
Mordecai (quickly): Muscle Man smashed it because Starla made him angry.
Benson: Liar! And also, every cent is gone! Where's the money?!
Rigby: We don't know Benson!
Benson: Oh really? Than why is that hedgehog eating a ten foot chilly dog?!
(Mordecai and Rigby turned around and saw Sonic eating the chilly dog)
Mordecai: Dude! Why?!
Sonic: I love chilly dogs and I'm really hungry.
Benson: Why don't I ask this hedgehog what happened to all the money.
Sonic: I have a name! It's Sonic (burp!). Sonic the Hedgehog!
Mordecai: Dude, everyone knows you're a hedgehog! You don't need to keep telling us!
Sonic: I like telling everyone!
Benson: So anyway, Sonic. Who stole all my money?
Mordecai: It's not your money Benson! It's the park's!
Benson: Shut up Mordecai!
(Sonic stared at Benson and then Mordecai and Rigby multiple times. He then burped and rubbed his tummy)
Sonic: Delicious! So anyway Benson, it was probably my enemy Dr Eggman who stole your money. These two paid for the chilly dog with their own money.
(There was silence)
Benson (quietly): Fine.
(Mordecai and Rigby let out a sigh of relief)
Benson: I knew it was you!
Mordecai: Benson, we were broke. What else could we have done?
Benson: You could have earned your own money!
(Benson turned even redder than before. He was like a tomato)
Benson: You're-
Sonic: Wait!
(Benson stopped)
Benson: What?!
Sonic: I didn't know whether you knew this or not, but I'm actually not from here.
Benson: I knew that!
Sonic: Liar.
Benson: Don't call me a liar hedgehog!
Sonic: I'll continue. I'm from a place called the Green Hill Zone. It's in a different dimension.
(Mordecai, Rigby and Benson's eyes had widened)
Sonic: I got struck by lightning and then I ended up here. I need help getting back to my world so I can save everyone from my horrible enemy Dr Eggman. So let these two help me and if they don't get me back within a few days, fire them.
(Benson gritted his teeth)
Benson: Fine. I'll give you three days. If you can't get Sonic back to his world by then, I'm gonna need your resignation forms.
Mordecai: Only three days?! That's impossible!
Benson: Than I suggest you get to it.
(Rigby groaned)
Rigby: I guess we'll be handing in our resignation forms than.