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Milo CoyStan
Jack BlackGrown Up Stan (voice)
Lee EddyMom
Bill WiseDad
Natalie L'AmoreauxVicky
Josh WigginsSteve
Jessica Brynn CohenJana
Sam ChipmanGreg
Danielle GuilbotStephanie
Zachary LeviKranz
Glen PowellBostick
Larry Jack DotsonGrandfather
Mona Lee FultzGrandmother #1
Jennifer GriffinGrandmother #2
Holt BoggsSam The Rocket Man
Reese ArmstrongTonyNatalie JoyMusic Class TeacherSuzanne Deal BoothScience TeacherChris OlsonPrincipal Cowan
Samuel DavisPinball BuyerMia GonzalezStatue-Maker Kid
Brian VillalobosBales
Chris ZurcherJackAlexander FinkKid on AstrowayZia KinzyYoung Lady on Astroway
David DeLaoMr. St. GeorgeNoah RandallDrive-In EmployeeAthena WintleMindyXavier PattersonEmanuel
Nick StevensonSIMSUPWilliam CarrollAbominable Snowman
Avery Joy DavisLisa (uncredited)
Christian MoranHoodlum (uncredited)Nicholas Andrew RiceNASA Controlman (uncredited)
Keslee BlalockAstroWorld Kid (uncredited)Brent A. RiggsService Station Attendant (uncredited)
P. Michael Hayes IISIMSUP (uncredited)Flint NattingerLaughing Boy (uncredited)
