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)