Harry Calder

George Segal

Agent Hoyt

Richard Widmark

Young Man

Timothy Bottoms

Keefer

Harry Guardino

Simon Davenport

Henry Fonda

Fran

Susan Strasberg

Tracy Calder

Helen Hunt

Helen

Dorothy Tristan

Benny Neilson

Harry Davis

Park Manager Lyons

Stephen Pearlman

Wayne Moore

G.F. Rowe

Wayne Moore

Gerald Rowe

Police Captain Christie

Wayne Tippit

Demerest

Michael Bell

Owner #2

Quinn K. Redeker

Rock Concert MC

Charlie Tuna

Mayor

Robert Quarry

Federal Agent

Lonny Stevens

Mandell

Richard Altman

Messenger (uncredited)

Steve Guttenberg

Jackie

Gloria Calomee

Hippie Boy

Craig Wasson

Federal Agent

Tom Baker

Hippy

Ava Readdy

Self - Sparks (uncredited)

Russell Mael

Sparks

Ron Mael

Girl in Line

Jean Rasey

Quinlan

William Prince

Owner

Dick McGarvin

Boy in Line

Greg Elliot

Coaster Attendant

Tara Buckman

Owner

Harry Basch

Tourist Mother

Monica Lewis

Tourist Father

Dick Wesson

Owner

Arthur Peterson

Bomb Squad #1 (as Bruce Kimbell)

Bruce Kimball

Bomb Squad #2

Bruce French

Bomb Squad #3

Stephen Mendillo

Bomb Squad #4

Larry Holt

Bomb Squad #5

Gene Tyburn

Agent with Red Hat

Mark Thomas

Bomb Squad

Charles W. Bennett Jr.

Selby

Bill Sorrells

Guard

Joe George

Radio Reporter

Gary Franklin

Man in Robe

David Milton

Pet Store Owner

David Byrd

Smoking Technician

Henry Olek

Pierce

Dennis Speigel

Oriental

Bill Saito

Oriental

Takayo Doran

Radio Technician

Roger Steffens

Pregnant Agent

Dianne T. Murray

Delivery Boy

Mark Hulcher

Lansing

John F. Swanson

Hertz Girl

Denice Harlow

Shooting Gallery Attendant

J. Michael Hunter

Coaster Attendant

Louis Weisberg