Ian Hendry

as Col Tom Llewellyn

Alan Badel

as Dr. David Neville

Barbara Ferris

as Susan Eliot

Alfred Burke

as Colin Webster

Clive Powell

as Paul

Yoke-Moon Lee

as Mi Ling

Roberta Rex

as Nina

Gerald del Sol

as Aga Nagalo

Mahdu Mather

as Rashid

Frank Summerscale

as Mark Robbin

Sheila Allen

as Diana Looran

Ralph Michael

as Minister of Defense

Martin Miller

as Prof. Gruber

Patrick Wymark

as Commander

Harold Goldblatt

as Harib

Bessie Love

as Mrs. Robbin

Tom Bowman

as General Miller

Andre Mikhelson

Peter Thompson

Patrick White

as Mr. Davidson

Jack Berg

Eddie Boyce

Ian Cullen

Joe Dunne

Ernest Fennemore

Patrick Halpin

Philip Johns

Annette Kerr

Arnold Lee

Martin Lyder

Frank Maher

Terence Maidment

Richard Marner

Leo McKern

Tony O'Leary

Bill Rayment

Michael Robbins