Roddy McDowall

Character: Caesar

Don Murray

Character: Breck

Ricardo Montalban

Character: Armando

Hari Rhodes

Character: MacDonald

Severn Darden

Character: Kolp

Lou Wagner

Character: Busboy

Natalie Trundy

Character: Lisa

John Randolph

Character: Commission Chairman

Asa Maynor

Character: Mrs. Riley

Joyce Haber

Character: Zelda

H.M. Wynant

Character: Hoskyns

David Chow

Character: Aldo

Buck Kartalian

Character: Frank - Gorilla

John Dennis

Character: Policeman

Paul Comi

Character: 2nd Policeman

Gordon Jump

Character: Auctioneer

Dick Spangler

Character: Announcer

Hector Soucy

Character: Ape With Chain

James Bacon

Character: Ape (uncredited)

Rayford Barnes

Character: Riot Control Commander in Plaza (uncredited)

William Bryant

Character: Man at Auction (uncredited)

Jean Byron

Character: Book Store Owner (uncredited)

Sam Chew Jr.

Character: Controller (uncredited)

Francis De Sales

Character: Auction Attendee (uncredited)

Peter Eastman

Character: Auction Attendee (uncredited)

Erin Fleming

Character: Cafe Customer (uncredited)

Daniel Keough

Character: Jailguard (uncredited)

Ron Pinkard

Character: Controller (uncredited)

Jeffrey Sayre

Character: Restaurant Chef (uncredited)

Ruth Foster

Character: Woman in Plaza (uncredited)