Eugene Deckers

Alf

Olaf Pooley

Detective-Interrogator

Gladys Henson

Attendant

Paul Hardtmuth

Priest

Michael Hordern

Lab Director Owens

George Benson

Sandwich Stand Customer

Eric Pohlmann

Joe - the bartender

John Horsley

Customs Officer

Patric Doonan

Customs Man

Joan Haythorne

Judy

Jill Balcon

Wardress (uncredited)

Hyma Beckley

Café Mimosa Patron (uncredited)

John Boxer

Police Sergeant at Customs Café (uncredited)

Ernest Butcher

Tom - Lab Assistant (uncredited)

Daniel Brown

Train Passenger (uncredited)

Robert Cawdron

Soldier at Station Checkpoint (uncredited)

Anton Diffring

Officer at Station (uncredited)

Toni Frost

Stewardess (uncredited)

John Gabriel

Night Field Telephone Officer (uncredited)

Charles Hammon

Train Passenger in Platform Line-up (uncredited)

Philo Hauser

Waiter (uncredited)

John G. Heller

Soldier at Station Check Point (uncredited)

Noel Johnson

Frank Conway (uncredited)

Sam Kydd

Customs Man (uncredited)

Richard Marner

Soldier on Train (uncredited)

Louis Matto

Café Mimosa Waiter (uncredited)

Anthony Newley

Operator (uncredited)

Michael Ritterman

The ‘Tail’ (uncredited)

Lance Secretan

Alan (uncredited)

Dinah Sheridan

Train Passenger at Checkpoint (uncredited)

Ewen Solon

Enemy Scientist (uncredited)

Emile Stemmler

Soldier at Station Checkpoint (uncredited)

Robert Vossler

Day Sentry at First Checkpoint (uncredited)

John Wilder

Customs Officer (uncredited)

Billy Wilmot

Café Mimosa Customer (uncredited)