Doctor Who: The Twin Dilemma.
After regenerating, the Doctor is confused and memory seems to come and go, Twin boys who are mathematical geniuses have been kidnapped and forced to work for a alien species.
This was the first outing for Colin Baker, and of course there was problems from the start with the writer having problems finishing the script and making excuses, Colin and Nicola having a some what frosty start which was settled due to miss communication between them both. This is the first time I have seen the debut of Colin Baker and feel it is like the first appearance of Sylvester McCoy in Time and The Rani, starts off strong then by episode 3 it begins to plummet downwards. When this debut on television it started off with 7.6 million viewers, by episode 4 there was 6.3 million viewers. Russell T. Davies has said that this season was the start of the decline of Doctor Who, I don't agree with that, IMO the series was still strong.
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