Smith will depart in this year’s Christmas special.

Moffat told Doctor Who Magazine: “One of the horrors of regeneration is that a certain amount of his persona alters entirely.”

The writer explained: “His appetites and his enthusiasm will change. And that’s sort of what I’m writing about now in Matt’s last episode, the fact that he’s terribly aware that he’s about to be rewritten. And it’s frightening…”

> Watch the Top 5 regeneration scenes.

> Find out all the latest details on Series 8 in our news summary.

What are your hopes for Matt Smith’s final episode? Let us know below…

> Order the complete Series 7 boxset on Amazon.

Watch the Series 7 Part 2 trailer…