Jet Fusion: a secret agent aided by Jimmy in the fight against Professor Calamitous and his daughter Beautiful Gorgeous. He is first seen in the episode "Operation: Rescue Jet Fusion" he is voiced by actor Christian Slater.
Butch Pakovski: Butch is the slightly slack-jawed, unintelligent bully of Lindbergh Elementary School who doesn't have many friends at all (except his younger brother-name unknown). He is mostly seen bullying Oleander and Carl. He is voiced by Rob Paulsen.
Brittany: Brittany is in Jimmy's class. She can dance well, as she is seen dancing with Cindy and Libby as a third partner....