Directed by Freddie Francis
Produced by Herman Cohen
Written by Aben Kandel
Story : Peter Bryan, John Gilling
Cinematography by Desmond Dickinson
Film Editing by Oswald Hafenrichter
Music by John Scott
Casting by Maude Spector
Art Direction by Geoffrey Tozer
Set Decoration by Helen Thomas
Makeup : Jimmy Evans
Monster Designer : Charles E. Parker
Cast
Joan Crawford (Dr. Brockton)
Michael Gough (Sam Murdock)
Bernard Kay (Inspector Greenham)
Kim Braden (Anne Brockton)
David Griffin (Malcolm Travers)
John Hamill (Cliff)
Thorley Walters (Magistrate)
Jack May (Dr. Selbourne)
Geoffrey Case (Bill)
Robert Hutton (Dr. Richard Warren)
Simon Lack (Colonel Vickers)
David Warbeck (Alan Davis)
Chloe Franks (Little Girl)
Maurice Good (Reporter)
Joe Cornelius (Trog)
John Baker (Anaesthetist)
Golda Casimir (Butcher)
Herman Cohen
Shirley Conklin (Little Girl's Mother)
Robert Crewdson (Dr. Pierre Duval)
Brian Grellis (John Dennis)
Paul Hansard (Dr. Kurtlimer)
Bartlett Mullins (Butcher)
Rona Newton-John (Reporter)
Cleo Sylvestre (Nurse)