- The Doctor struggles to adjust to his new self. 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.
- 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.—statmanjeff
- This is the first episode with Doctor #6: Colin Baker. The Doctor seeks to exile himself on the asteroid Titan 3 but instead encounters brainy twins Romulus and Remus, who've been kidnapped by the devious Prof. Edgeworth (Maurice Denham) as part of a plan hatched by alien slug Mestor (Edwin Richfield). Also crash-landing on Titan 3 is Lt. Hugo Lang (Kevin McNally), who's been dispatched from Earth to rescue the twins -- but first must be rescued himself.
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