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===Sixth Doctor (1984-1986)===

===Sixth Doctor (1984-1986)===

The Sixth Doctor was premised around being the antithesis of his predecessor, with his garish and color-mismatched costume reflecting the vast contrast with the mild-mannered fifth Doctor. In terms of characterization, the Doctor became something of an unstable character, often violently responding to people and events around him.  The Sixth Doctor is the first Doctor to be played by two different actors.  In ''The Time and the Rani,'' he was briefly played by Sylvester McCoy, just long enough for the regeneration in to his next incarnation, as [[Colin Baker]] had declined to return for a regeneration sequence, making him the first actor to play the Doctor to not film a regeneration.

The Sixth Doctor was premised around being the antithesis of his predecessor, with his garish and color-mismatched costume reflecting the vast contrast with the mild-mannered fifth Doctor. In terms of characterization, the Doctor became something of an unstable character, often violently responding to people and events around him.  The Sixth Doctor is the first Doctor to be played by two different actors. [[Colin Baker]] was also the first actor to play the Doctor to play a guest role in the show prior to playing the Doctor.  He appeared in the 1983 story, ''Arc of Infinity,'' as Commander Maxil.  In ''The Time and the Rani,'' he was briefly played by Sylvester McCoy, just long enough for the regeneration in to his next incarnation, as Colin Baker had declined to return for a regeneration sequence, making him the first actor to play the Doctor to not film a regeneration.

===Seventh Doctor (1987-1989)===

===Seventh Doctor (1987-1989)===