Charlton Heston

Stewart Graff

Ava Gardner

Remy Royce-Graff

George Kennedy

Sgt. Lew Slade

Lorne Greene

Sam Royce

Geneviève Bujold

Denise Marshall

Richard Roundtree

Miles Quade

Marjoe Gortner

Jody

Barry Sullivan

Dr. Willis Stockle

Lloyd Nolan

Dr. James Vance

Victoria Principal

Rosa Amici

Walter Matthau

Drunk

Gabriel Dell

Sal

Pedro Armendáriz Jr.

Chavez

Lloyd Gough

Bill Cameron

John Randolph

Los Angeles Mayor

Scott Hylands

Asst. Caretaker

Donald Moffat

Dr. Harvey Johnson

Alan Vint

Ralph

George Murdock

Colonel

John Dennis

Brawny Foreman

Josh Albee

Boy with Radio (uncredited)

Reb Brown

Young Man on Motorcycle (uncredited)

David S. Cass Sr.

Sherriff Merle (uncredited)

Erik Cord

Office Worker (uncredited)

Ken DuMain

Earthquake Survivor in Wilson Plaza (uncredited)

Kenny Endoso

Bar Cook (uncredited)

Jerry Hardin

Man (uncredited)

Bob Harks

Man Fleeing Movie Theatre (uncredited)

Bert Kramer

Policeman (uncredited)

Stuart Nisbet

Man on Loudspeaker (voice) (uncredited)

Charlie Picerni

Pool Player (uncredited)

Leoda Richards

Emergency Soup Kitchen Worker in Wilson Plaza (uncredited)

Debralee Scott

Kathie (TV version) (uncredited)

Eddie Smith

Citizen (uncredited)

Arthur Tovey

Citizen (uncredited)

Dick Tufeld

Opening Narrator (uncredited)

Sandy Ward

Studio Guard (uncredited)

Dick Warlock

Diver at Hollywood Reservoir (uncredited)