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Jodie Whittaker's regeneration introduces a new Doctor in Doctor Who.

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At the conclusion of the 90-minute programme The Power of the Doctor, Whittaker unpredictably transformed into Tennant.

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The well-known actor, who previously portrayed the part from 2005 and 2010, has officially returned as the 14th Doctor, according to the BBC.

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What a fantastic, lovely thing to get to revisit something that was such a wonderful, happy, and crucial time in my life, Tennant said to BBC News.

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The actor had been recording scenes for the sci-fi drama's 60th anniversary, it was revealed earlier this year.

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He will be appearing in three episodes of the show instead of just a quick cameo as Whittaker's replacement.

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The show follows the exploits of the Doctor, a Time Lord who looks to be human but is actually from another planet.

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The BBC has been airing the British science fiction television series Doctor Who since 1963.