Vrijgegeven: May 15, 1971
Looptijd: 150 minuten
Genre: Sciencefiction, Drama, Avontuur
Sterren: Jon Pertwee, Katy Manning, Nicholas Courtney, Roger Delgado, Nicholas Pennell, John Ringham
Crew: Malcolm Hulke (Writer), Michael E. Briant (Director), Terrance Dicks (Script Editor), Barry Letts (Producer), Jan Harrison Shell (Makeup Artist), William Symon (Editor)