The Doctor (Colin Baker) is suffering from some post-regenerative trauma, and, after trying to strangle companion Peri, takes off to a deserted asteroid to become a hermit. There he discovers a plot by the Gastropod Mestor to kidnap two mathematically brilliant twins and shift some planets around in order to release more of his slimy ilk. Obviously he has to be stopped, but is the Doctor up to it? Colin Baker's first outing as the Doctor.

All three seasons of Terry Nation's acclaimed BBC science fiction drama in which 95% of the population have been wiped out by a freak plague, leaving the remaining survivors to rebuild civilisation. Episodes are: 'The Fourth Horseman', 'Genesis', 'Gone Away', 'Corn Dolly', 'Gone to the Angels', 'Garland's War', 'Starvation', 'Law and Order', 'The Future Hour', 'Revenge', 'Something of Value', 'A Beginning', 'Birth of Hope', 'Greater Love', 'Lights of London (Parts 1 and 2)', 'The Face of the Tiger', 'The Witch', 'A Friend in Need', 'By Bread Alone', 'The Chosen', 'Parasites', 'New Arrivals', 'Over the Hills', 'New World', 'Manhunt', 'A Little Learning', 'Law of the Jungle', 'Mad Dog', 'Bridgehead', 'Reunion', 'The Peacemaker', 'Sparks', 'The Enemy', 'The Last Laugh', 'Long Live the King' and 'Power'.