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The two-part Doctor Who Christmas special, 'The End of Time', will also be David Tennant's last outing as the Time Lord.
The story will see the Doctor once more pitted against The Master (John Simm) - before the character's regeneration into his latest incarnation, who will be played by Matt Smith.
The BBC's Lizo Mzimba went to meet David Tennant to find out how he was feeling about bowing out of the series.
(Thanks to Shaun Holder for the link).