The Atom [Ryan Choi]; Giganta [Dr. Doris Zeul] (villain); Mr. Choi (Ryan Choi's Dad); Dr. Panda Potter; Professor Helmond Kettering; Dr. Thomas Dinawa; Dr. Martin Campbell; Dean Mayland; Dwarfstar [Sylbert Rundine] (villain); Praetor (villain); Centurion (villain)