Barry Newman as Dr. Frank Whitman

Susan Clark as Diana Brockhurst-Lautrec

Shelley Winters as Nurse Andrea Harper

Leslie Nielsen as Mayor William Dudley

James Franciscus as Jimbo

Ava Gardner as Maggie Grayson

Henry Fonda as Fire Chief Risley

Jonathan Welsh as Herman Stover

Hilary Farr as Mrs. Adams

Richard Donat as Captain Harrison Risley

Mavor Moore as John O'Brien

Donald Pilon as Dr. Matwick

Terry Haig as Terry James

Cec Linder as Councilman Paley

Ken James as Andrew

Jefferson Mappin as Beezer

Earl Pennington as Mr. Clark

Sonny Forbes as Tom

Bronwen Mantel as Sarah Watts

Janice Chaikelson as Debbie Watts

Steven Chaikelson as Gerald Watts

Murray Cruchley as Tony Miller

Jérôme Tiberghien as Fireman Waller

Mel Ryane as Nurse Florence Stoddard

Anthony Sherwood as Sam

John Friesen as Albert

Nancy Beatty as Mary Stover

Doug Smith as Attendant Franks

Maria De Aragon as Nurse (uncredited)

Emil Glassbourg as Doctor (uncredited)