Game-Breaker: Marty's unification ray. Shakurankai shrugs off all of the teams attacks until this thing annihilates him.
What an Idiot!: None of the super villains (neither parents or teachers) explain to the kids that the battles are staged. In addition, they send the kids to a school for how to be a super villain. Unsurprisingly, the kids end up accidentally killing a superhero, which the Skull Bros intend to use to spark a superhero / villain war.