Robert Hays

D.H. 'Hank' Mercer / Biff Deegan

Catherine Mary Stewart

Marissa

Christopher Murney

Lt. Greenberg

Fred Gwynne

Victor Greville

Celeste Holm

Claire

Jonathan Moore

Nicholas Rubinstein

Martin Neufeld

Pete

Michael Copeman

Bunty Webb

Eric Keenleyside

Robin Ward

Eric Fink

Thick Wilson

Al Bernardo

Louis Di Bianco

Marc Gomes

Raymond Hunt

James Walton

Lynne Cormack

Lynne Gorman

Robbi Baker

Alan Rose

Tony (uncredited)

Jacques Sandulescu

Timothy (uncredited)

Lewis J. Stadlen

Norman Wagstaff (uncredited)

Gavin Steed

Roger Delacroix (uncredited)