Rod Taylor as Brian Ian "Boysie" Oakes

Trevor Howard as Mostyn

Jill St. John as Iris MacIntosh

Wilfrid Hyde-White as Chief

Eric Sykes as Griffen

John Le Mesurier as Chekhov

Derek Nimmo as Fly

David Tomlinson as Quadrant

Akim Tamiroff as Sheriek

Gabriella Licudi as Corale

Jennifer Jayne as Janice Benedict

Suzy Kendall as Judith

Richard Wattis as Flying Instructor

Jeremy Lloyd as Male Secretary

Heller Toren as Benedict's Assistant

Betty McDowall as Frances Anne Chandler

Daniel Emilfork as Gregory

Jo Rowbottom as Betty

Colin Gordon as Vicar

Louise Dunn as Jessie

Scot Finch as Operations Officer

Ronald Leigh-Hunt as Mac

David Langton as Station Commander

Alexandra Bastedo as Radio Operator