Monkey is the intergalactic defender of the universe. He is a superhero utilising his many powerful abilities to fight the threatening super-natural evil doers of the cosmos. But he also lives a regular life in Dexter’s laboratory as a regular test monkey.

Dial M For Monkey was developed as part of the Dexter's Laboratory show. Each episode featured two Dexter's Laboratory shorts and a third related short—either Justice Friends or Dial M For Monkey. Justice Friends is about a group of super heroes challenged more by the problems of living together than by the evil forces that threaten the world. The star of Dial M For Monkey is, of course, “Monkey,” a superpowered, crime-fighting primate who sets out to save the world when Dexter isn’t looking.