Outgoing Doctor Who David Tennant has said that viewers will be left “heartbroken” by the plot twists as he departs the series.

Speaking on BBC Breakfast ahead of his last ever appearance as the Doctor on New Year’s Day, Tennant hinted at what audiences could expect from the show.

“Coming to the final episodes, you think will these live up to one’s hopes for what that finale will be?” he said.

“And then you read the script – The Doctor’s been told he’s going to die, he knows he’s going to die, so you get to play that new flavour with this character that you’ve got to know so well… suddenly you’re playing a man who knows his end is coming.”

The story is a continuation of the two-part episode The End Of Time, which began on Christmas Day – and sees The Doctor facing the prophecy that he will “knock four times”.

When you find out what that really means, it just breaks your heart,” Tennant added, “it’s brilliant.”

He also admitted to being “maybe a little” jealous of his replacement Matt Smith, because he knew he would be having a “fantastic time” playing the role.