Every episode from the 12th series of the classic BBC sci-fi adventure drama starring Tom Baker as the legendary Time Lord. In this instalment, the newly-regenerated Doctor (Baker), assisted by Sarah Jane Smith (Elisabeth Sladen) and Harry Sullivan (Ian Marter), investigates the mysterious Think Tank and takes on dangerous enemies including the giant robot K-1, a Sontaran warrior, the Daleks and the Cybermen. The episodes are: 'Robot', 'The Ark in Space', 'The Sontaran Experiment', 'Genesis of the Daleks' and 'Revenge of the Cybermen'.