Sidney Poitier as Alan Newell

Anne Bancroft as Inga Dyson

Telly Savalas as Dr. Joe Coburn

Steven Hill as Mark Dyson

Ed Asner as Det. Judd Ridley

Indus Arthur as Marian

Paul Newlan as Sgt. Harry Ward

Dabney Coleman as Charlie

H.M. Wynant as Doctor Morris

Robert F. Hoy as Patrolman Steve Peters

Greg Jarvis as Chris Dyson

Jason Wingreen as Medical Technician

Marjorie Nelson as Mrs. Thomas

Steven Marlo as Arthur Foss

Thomas Hill as Liquor Salesman

Lane Bradford as Al McCardle

Janet Dudley as Edna

John Napier as Dr. Alden Van

Stephen Pellegrini as Police Cadet

Jerome R. Brand as Police Cadet

Kay Doubleday as Jinny

Jo Helton as Registration Nurse

Richard Doorish as Pete

Charlotte Stewart as Telephone Operator

Viola Harris as Telephone Supervisor

George Savalas as Pool Player

O.L. Haavik as Pastor (as Dr. O.L. Haavik)

Nicholas Prebezac as Child at Beach

Drew Eskenazi as Child at Beach

Erin Almond as Child at Beach

Pam Bagby as Child at Beach

William R. Rhodes as Police Station Dispatcher

Charles C. Andrews as Motel Manager

Melody Greer as Zipper Girl

Sons of Adam as Discotheque Band

Walter Maslow as 1st TV Newsman (as Walter Mazlow)

Allen Emerson as 2nd TV Newsman

Lou Clark as Nightwatchman

David Harris as Nightwatchman

Phillip Browne as Office Boy

Archie Smith as Janitor

Joseph R. Denini as Fire Station Dispatcher

Fay Baker as Telephone Supervisor (uncredited)

Susan Bartel as Typist (uncredited)

John Benson as Patrolman Bert Enyard (uncredited)

Regina Carrol as minor role (uncredited)

Karen Norris as Mrs. Hillman, Inga's Nurse (uncredited)