Dexter's nemesis is a rival boy-genius from his school named Susan "Mandark" Astronomonov[REF][REF] (voiced by Eddie Deezen).
The Justice Friends consists of Major Glory (voiced by Rob Paulsen), Valhallen (voiced by Tom Kenny), and the Infraggable Krunk (voiced by Frank Welker), three superheroes who are all roommates living in an apartment complex called Muscular Arms.