Robert Hays as D.H. 'Hank' Mercer / Biff Deegan

Catherine Mary Stewart as Marissa

Christopher Murney as Lt. Greenberg

Fred Gwynne as Victor Greville

Celeste Holm as Claire

Jonathan Moore as Nicholas Rubinstein

Martin Neufeld as Pete

Michael Copeman as

Bunty Webb as

Eric Keenleyside as

Robin Ward as

Eric Fink as

Thick Wilson as

Al Bernardo as

Louis Di Bianco as

Marc Gomes as

Raymond Hunt as

James Walton as

Lynne Cormack as

Lynne Gorman as

Robbi Baker as

Alan Rose as Tony (uncredited)

Jacques Sandulescu as Timothy (uncredited)

Lewis J. Stadlen as Norman Wagstaff (uncredited)

Gavin Steed as Roger Delacroix (uncredited)