Roddy McDowall (Caesar), Claude Akins (General Aldo), Natalie Trundy (Lisa), Severn Darden (Kolp), Lew Ayres (Mandemus), Paul Williams (Virgil), Austin Stoker (MacDonald), Noah Keen (Lehrer), Richard Eastham (Mutantencaptain), France Nuyen (Alma), John Huston (der Gesetzgeber), Paul Stevens (Mendez), Heather Lowe (Ärztin), Bobby Porter (Cornelius), Michael Stearns (Jake), Cal Wilson (Soldat), Pat Cardi (junger Schimpanse), John Landis (Jakes Freund), Andy Knight (Mutant auf Motorrad), James Bacon (Gorillasoldat), Eric Braeden (Dr. Otto Hasslein), Colleen Camp (Julie), Paula Crist (Girl im Corral), Jimmy Gambina (Orang-Utan), David Gerrold (Schimpanse), Dominique Green (weiblicher Affe), Kim Hunter (Dr. Zira), Sam Maronie (Mutantentechniker), Lou Wagner (Hilfskellner)