MONSTERS

Cast(in order of appearance): Hobbes Jacobson, Calvin Jacobson, Andy Adams, Zoe Jacobson, Susie Derkins, Binky Betsy, Mr. Bun, Nivlac and Sebboh, Calvin's monsters

Plot
Nivlac and Sebboh mysteriously turn evil, try to steal the transmogrifier and use the monsters under Calvin's bed as a army.

Transcript
MONSTERS transcript

Trivia

 * Cartoon Network usually aires this with episode The alternate universe first.
 * This is this last episode of Season 3.
 * This episode is aired on an hour-long movie, making it a whopping 1:30:00 length along with The alternate universe.  It is thirty minutes shorter than the movie.