Trog

Joan Crawford

Dr. Brockton

Michael Gough

Sam Murdock

Bernard Kay

Inspector Greenham

Kim Braden

Anne Brockton

David Griffin

Malcolm Travers

John Hamill

Cliff

Thorley Walters

Magistrate

Jack May

Dr. Selbourne

Geoffrey Case

Bill

Robert Hutton

Dr. Richard Warren

Simon Lack

Colonel Vickers

David Warbeck

Alan Davis

Chloe Franks

Little Girl

Maurice Good

Reporter

Joe Cornelius

Trog

John Baker

Anaesthetist (uncredited)

Tim Barrett

John Dennis (uncredited)

Jack Carter

Police Officer (uncredited)

Golda Casimir

Professor Manoskiensky (uncredited)

John D. Collins

TV Crewman (uncredited)