Castrovalva (TV story)

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The Doctor's latest regeneration has proven more unstable then his previous ones. Adric has been captured by the Master, who is taking advantage of the Doctor's weakened state to ensnare him in an elaborate trap whose recursive nature threatens to destroy his mind. (Click here for a Full Synopsis)

Cast

Portreeve - Neil Toynay (pseudonym for Anthony Ainley)

Uncredited

Fourth Doctor - Tom Baker

This is the first Fifth Doctor story aired, although it was not Peter Davison's first work on the series; he had a brief appearance in "Logopolis"

Tom Baker appears in the opening sequence, a replay of the regeneration scene which ended "Logopolis," but he is not listed in the credits.

The Portreeve is listed in the credits as being played by "Neil Toynay", an anagram of "Tony Ainley". This was a play on the Master's habit of using either anagrams or synonyms for "Master" as aliases.