Zeppelin

Michael York

— Geoffrey Richter-Douglas

Elke Sommer

— Erika Altschul

Peter Carsten

— Major Tauntler

Marius Goring

— Professor Christian Altschul

Anton Diffring

— Colonel Hirsch

Andrew Keir

— Von Gorian

Rupert Davies

— Captain Whitney

Alexandra Stewart

— Stephanie

William Marlowe

— Anderson

Alan Rothwell

— Brandner

Richard Hurndall

— Blinker Hall

John Gill

— Meier

Michael Robbins

— Cockney Sergeant

Ben Howard

— Jamie Fergusson

George Mikell

— German Officer

Arnold Diamond

— Major Proudfoot

Clive Morton

— Lord Delford

Bryan Coleman

— Colonel Whippen

Gary Waldhorn

— Harlich

Ronald Adam

— Prime Minister

Frazer Hines

— Radio Operator

Ruth Kettlewell

— Mrs. Parker

Ray Lonnen

— Sgt. Grant

Dorian Healy

— Child (uncredited)