John Mills

Superintendent Graham

Horst Buchholz

Korchinsky

Hayley Mills

Gillie

Yvonne Mitchell

Anya

Megs Jenkins

Mrs. Phillips

Anthony Dawson

Barclay

George Pastell

Poloma Captain

Paul Stassino

Poloma First Officer

Marne Maitland

Doctor

Meredith Edwards

Williams

Marianne Stone

Mrs. Williams

Rachel Thomas

Mrs. Parry

Kenneth Griffith

Mr. Seymour

Christopher Rhodes

Inspector Bridges

Michael Anderson Jr.

Boy with Cap Gun (uncredited)

Harry Baird

Bridegroom (uncredited)

Tom Bowman

Seaman (uncredited)

Jim Brady

Pub Customer (uncredited)

Peter Halliday

Seaman (uncredited)

Glyn Houston

Detective at Police Station (uncredited)