Roddy McDowall as Galen
Ron Harper as Alan Virdon
James Naughton as Pete Burke
Mark Lenard as Urko
Ron Stein as Gorilla Guard
Booth Colman as Zaius
Eldon Burke as Chilot
Tom McDonough as Macor
John Hoyt as Prefect Barlow
Jacqueline Scott as Kira
John Milford as Miller
Martin E. Brooks as Konag
Pat Renella as Jason
Bobby Porter as Arno
Biff Elliot as Orangutan
William Beckley as Council Orang
Wayne Foster as Gorilla Sergeant
Nick Dimitri as A Gorilla
William Smith as Tolar
Beverly Garland as Wanda
Joanna Barnes as Carsia
Sondra Locke as Amy
Roscoe Lee Browne as Hurton
John Ireland as Brun
Royal Dano as Farrow
Morgan Woodward as Martin
Norman Alden as Zako
Geoffrey Deuel as Anto
Percy Rodrigues as Aboro
Zina Bethune as Arn
Jane Actman as Fauna
Jackie Earle Haley as Kraik
Michael Conrad as Janor
Frank Aletter as Leuric
Jay Robinson as Bandor
Woodrow Parfrey as Veska
Anne Seymour as Ann
Michael Strong as Travin
David Sheiner as Zoran
Lonny Chapman as Polar
Ben Andrews as Miro
Marc Singer as Dalton
Joseph Ruskin as Daku
Richard Devon as Zandar
John McLiam as Gahto
Ron Soble as Kava
Norman Burton as Yalu
Robert Phillips as Gorilla Captain
Jennifer Ashley as Talia
Cindy Eilbacher as Lisa Miller
Music by the great Kevin MacLeod