Robert Powell

Richard Hannay

David Warner

Sir Edmund Appleton

Eric Porter

Chief Superintendent Lomas

Karen Dotrice

Alex Mackenzie

John Mills

Scudder

George Baker

Sir Walter Bullivant

Ronald Pickup

Bayliss

Donald Pickering

Marshall

Timothy West

Porton

Miles Anderson

David

Andrew Keir

Lord Rohan

Robert Flemyng

Magistrate

William Squire

Harkness

David Collings

Tillotson

John Normington

Fletcher

John Welsh

Lord Belthane

Edward de Souza

Woodville

Tony Steedman

Admiral

Donald Bisset

Renfrew

Oliver Maguire

Martins

Joan Henley

Lady Nettleship

Prentis Hancock

Perryman

James Garbutt

Miller

Artro Morris

The Scot

Robert Gillespie

Crombie

Raymond Young

Guide

Michael Bilton

Vicar

Guy Standeven

General (uncredited)

Jill Goldston

Nun (uncredited)