Richard Roundtree

Miles Quade

Marjoe Gortner

Jody

Barry Sullivan

Dr. Willis Stockle

Lloyd Nolan

Dr. James Vance

Victoria Principal

Rosa Amici

Walter Matthau

Drunk

Monica Lewis

Barbara

Gabriel Dell

Sal

Pedro Armendáriz Jr.

Chavez

Lloyd Gough

Bill Cameron

John Randolph

Los Angeles Mayor

Kip Niven

Walter Russell

Scott Hylands

Asst. Caretaker

Tiger Williams

Corry

Donald Moffat

Dr. Harvey Johnson

Jesse Vint

Buck

Alan Vint

Ralph

Lionel Johnston

Hank

John Elerick

Carl Leeds

John S. Ragin

Chief Inspector

George Murdock

Colonel

Don Mantooth

Sid

Michael Richardson

Sandy

Alex Brown

Pool Player

Bob Cunningham

Dr. Frank Ames

John Dennis

Brawny Foreman

Gene Dynarski

Dam Caretaker

Bob Gravage

Farmer Mr. Griggs

H.B. Haggerty

Pool Player

Tim Herbert

Las Vegas Man

Dave Morick

Technician

Ines Pedroza

Laura

Josh Albee

Boy with Radio (uncredited)

Benjie Bancroft

Citizen (uncredited)

Buzz Barbee

Restaurant Patron (uncredited)

Joan Blair

Pawnbroker's Wife (TV version) (uncredited)

Hal Bokar

Dam Workman (uncredited)

Reb Brown

Young Man on Motorcycle (uncredited)

Vivian Brown

Woman (uncredited)

Ian Bruce

Officer Scott (Wilson Plaza) (uncredited)

Ric Carrott

National Guardsman (uncredited)

Lonny Chapman

LAPD Captain (uncredited)

Sam Chew Jr.

Tony (Kathie's Husband) (uncredited)

Shannon Christie

Dr. Vance's Nurse (uncredited)

Caitanya Dasi

Hare Krishna (uncredited)

Cinmayi Devi

Hare Krishna (uncredited)

Ken DuMain

Earthquake Survivor in Wilson Plaza (uncredited)

Brent Dunsford

Man Drinking from Plastic Cup in Wilson Plaza (uncredited)

Dotty Ertel

Earthquake Survivor (uncredited)

Bobby Ferro

Sports Car Thief (uncredited)

Bruce M. Fischer

Man (uncredited)

Sig Frohlich

Doctor (uncredited)

James W. Gavin

Helicopter Pilot (uncredited)

Ernest Harada

Seismologist (uncredited)

Jerry Hardin

Man (uncredited)

Bob Harks

Man Fleeing Movie Theatre (uncredited)

Lars Hensen

Citizen (uncredited)

Diana Herbert

Woman (uncredited)

Bert Kramer

Policeman (uncredited)

Paul LeClair

National Guardsman (uncredited)

Karl Lukas

Man (uncredited)

Ernesto Molinari

Citizen (uncredited)

Stuart Nisbet

Man on Loudspeaker (voice) (uncredited)

Frances Osborne

Housewife (uncredited)

Grant Owens

Police Officer (uncredited)

Tony Regan

Man Fleeing Movie Theatre (uncredited)

Leoda Richards

Emergency Soup Kitchen Worker in Wilson Plaza (uncredited)

Clark Ross

Man in Outer Office (uncredited)

George Sawaya

Deputy Sherriff (uncredited)

Mark Sawtelle

Boy (uncredited)

Fred Scheiwiller

Jay the Bartender (uncredited)

Debralee Scott

Kathie (TV version) (uncredited)

Dean Smith

Pool Player (uncredited)

Eddie Smith

Citizen (uncredited)

Norman Stevans

Radio Station Technician (uncredited)

Arthur Tovey

Citizen (uncredited)

John Tuell

Prop Tractor Driver (uncredited)

Dick Tufeld

Opening Narrator (uncredited)

Kitty Vallacher

Grocery Store Clerk (uncredited)

Keith Walker

Man on the Radio (voice) (uncredited)

Sandy Ward

Studio Guard (uncredited)

Rick Warick

Office Worker (uncredited)

Dick Warlock

Diver at Hollywood Reservoir (uncredited)

William Whitaker

Ambulance Driver (uncredited)

Don Wilbanks

Dam Workman with Blowtorch (uncredited)

Forrest Wood

Man (uncredited)

Clint Young

Dam Workman (uncredited)