New 'Doctor Who' companion announced

21-year-old Karen Gillan has been named as the new companion for series five of Doctor Who.

The Scottish actress will star alongside Matt Smith, who takes over from David Tennant as The Doctor in series five of the long-running cult show.

"I am absolutely over the moon at being chosen to play the Doctor's new companion," said Gillan. "The show is such a massive phenomenon that I can't quite believe I am going to be a part of it. Matt Smith is an incredible actor and it is going to be so much fun to act alongside him – I just can't wait to get started!"

Gillan previously appeared in Who as a soothsayer in the series four episode 'The Fires of Pompeii'. Her other credits include The Kevin Bishop Show, Rebus and Stacked.

Of Gillan's casting, new executive producer Steven Moffat said: "We saw some amazing actresses for this part, but when Karen came through the door the game was up. Funny, and clever, and gorgeous, and sexy. Or Scottish, which is the quick way of saying it. A generation of little girls will want to be her. And a generation of little boys will want them to be her too."

Rumoured contenders for the role of Matt Smith's assistant had included Lily Allen, Kelly Brook, Georgia Moffett and Skins star Hannah Murray.

Filming on the new series will begin in July for transmission around Easter 2010. Tennant's final episodes will air this Christmas.