The Doctor (Jon Pertwee) meets an old nemesis when The Master (Roger Delgado) unleashes his new invention, TOMTIT, Transmission Of Matter Through Interstitial Time. Trapping many of the members of the TARDIS crew in frozen time, The Master is tracked through time and space to Atlantis where he seduces Queen Galleia (Ingrid Pitt) in an attempt to obtain the necessary crystal that will make TOMTIT run properly. These six episodes include an appearance from a legend of science fiction cinema as David Prowse, the man behind the mask of Darth Vader, stars as Minotaur.