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Seth GreenMilo (voice)
Joan CusackMom (voice)
Dan FoglerGribble (voice)
Breckin MeyerAlien (voice)
Elisabeth HarnoisKi (voice)
Tom Everett ScottMilo's Dad (voice)
Mindy SterlingSupervisor (voice)
Julene ReneeMartian (voice)
Raymond OchoaMartian Hatchling (voice)
Robert OchoaMartian Hatchling (voice)
Ryan OchoaMartian Hatchling (voice)Seth Robert DuskyMilo (voice) (as Seth Dusky)
Amber Gainey MeadeMartian
Dee Bradley BakerTwo Cats (uncredited)Adam JenningsMartianAaron RapkeMartian
Jacquie BarnbrookMartian
Kevin CahoonWingnutKirsten SeversonMartian
Matthew HenersonMartian
Stephen KearinMartian
