David Tennant has revealed that throughout The End of Time the Tenth Doctor will be as in the dark as the audience, because he has no idea what his ultimate fate will be.

“We’ve explored different aspects of the Doctor and his personality and his loneliness and whatever else, and he still carries on,” the actor told The Age. “But now you’re faced with the possibility where he’s not going to carry on. His life is coming to an end. And he knows it, as well.”

He teased: “He’s been told: ‘Your song will end soon’, so he’s aware the sands of time are running. But that’s a gamble, isn’t it? You never know what you’re going to get.”

Part one of The End of Time will air at 6:00PM on Christmas Day on BBC1/HD, with part two following on New Year’s Day at 6:40PM.

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