Peter Cushing

Dr. Brian Stanley

Edward Judd

Dr. David West

Carole Gray

Toni Merrill

Eddie Byrne

Dr. Reginald Landers

Sam Kydd

Constable John Harris

Niall MacGinnis

Mr. Roger Campbell

James Caffrey

Peter Argyle

Liam Gaffney

Ian Bellows

Keith Bell

Halsey

Margaret Lacey

Old Woman

Peter Forbes-Robertson

Dr. Lawrence Phillips

Shay Gorman

Morton

Richard Bidlake

Carson

Edward Ogden

Helicopter Pilot

Joyce Hemson

Mrs. Bellows

Roger Heathcott

Dunley

Al Ramsen

Screenplay

Terence Fisher

Director

Edward Mann

Screenplay

John Earl

Art Direction

Reginald H. Wyer

Director of Photography

Richard Gordon

Executive Producer

Rosemary Burrows

Costume Design

Tom Blakeley

Producer

Malcolm Lockyer

Original Music Composer

Gerald A. Fernback

Executive Producer

Thelma Connell

Editor