THE DOCTOR'S COMPANION
See a bigger picture of the Doctor's new assistant.
It's the news all Doctor Who fans have been waiting for - who'll be joining the Doctor on his adventures in time and space.
Karen Gillan will play the companion to Matt Smith's Doctor when he takes over from David Tennant later this year.
Filming is beginning this summer for the hit sci-fi show, and Karen beat loads of people to get the part.
Karen said: "The show is such a massive phenomenon that I can't quite believe I am going to be a part of it."
It's not her first appearance in the Who-niverse, as she appeared in an episode called The Fires Of Pompeii.
Karen in The Fires of Pompeii
The show's executive producer Piers Wenger said: "We knew Karen was perfect for the role the moment we saw her.
"When she auditioned alongside Matt we knew we had something special. It is a partnership that is ready to take on the Universe!"