It started the same way in The Regular Tunes Show, but instead Mordecai and Rigby are sucked inside a wormhole and become superheroes (similar to Angry Birds Space). They didn't want Benson to know, because they thought that if Benson finds out he will fire them. But then Finn and Jake (from Adventure Time) finds out and joins them. Then they team up and save the world from Dr. Maldark.
( the Warner Bros Pictures shield appears while Rigby stands wearing a tuxedo while posing a Bugs Bunny Pose, until Mordecai comes)
Mordecai: Hey, Rigby! It's my turn to stand next to the W.B. shield. By the way, where did you get that donut?
Mordecai: What! Did you hear that?
Rigby: What? What?
Mordecai: (farts loudly)
Rigby: (covers his nose) Dude! That's gross, besides,can we play rock, paper, scissors' to see who can pose to the shield.
Mordecai: (sighs) Fine.
(Mordecai and Rigby) play 'RPS and sure enough, Rigby won)
Rigby: Yeah-Uh! Kiss my brown one-cheeked butt, idiot.
Mordecai: Can we skip to the movie?
(the creator of RS appears)
J.G. Quintel: Sure, Mordecai.
(scene cuts to the movie)