 Members of the audience for Intergalactic Showdown include the  Yokians (Jimmy Neutron: Boy Genius, "The Eggpire Strikes Back"),  Mitochondria ("Journey to the Center of Carl"), Lima bean monsters  ("I Dream of Jimmy"), the Junkman, Roxie, and Gortox the Irritable  ("The Junkman Cometh"), Zia and Barbarino ("A Beautiful Mine"), and  Captain Betty ("Monster Hunt").