Kevin McCarthy
Dr. Miles J. Bennell

Dana Wynter
Becky Driscoll

King Donovan
Jack Belicec

Carolyn Jones
Theodora 'Teddy' Belicec

Larry Gates
Dr. Dan 'Danny' Kauffman

Virginia Christine
Wilma Lentz

Jean Willes
Nurse Sally Withers

Ralph Dumke
Police Chief Nick Grivett

Whit Bissell
Emergency Room Psychiatrist

Richard Deacon
Emergency Room Doctor

Robert Osterloh
Ambulance Attendant

Tom Fadden
Uncle Ira Lentz

Everett Glass
Dr. Ed Pursey

Sam Peckinpah
Charlie the Meter Reader

Dabbs Greer
Mack Lomax

Harry J. Vejar
Man carrying pods in Mile's office (extra)

J. Pat O'Malley
Railroad Baggage Handler (extra)

Richard Deacon
Dr. Harvey Bassett (uncredited)

Frank Hagney
Townsman (uncredited)

Robert Osterloh
Ambulance Driver (uncredited)