The Twin Dilemma: Part One 1984
5.1 251 The Doctor's moods are wide and in a jumble as he settles into his new regeneration. Elsewhere a set of genius twins are kidnapped, whose mathematical computations can manipulate features of the universe. They're immediately put to work by aliens for an as yet unknown end.
Runtime: 25
Starts: Colin Baker, Nicola Bryant, Maurice Denham, Kevin McNally
Director: Peter Moffatt