Maisie Williams plays a Viking girl called Ashildr on this week’s Doctor Who

We’ve been waiting for Maisie Williams’ appearance on Doctor Who for what feels like agesssssssss. But the wait is nearly over.

The Game Of Thrones star plays Viking girl Ashildr in this week's episode.

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The Girl Who Died sees the Doctor (Peter Capaldi) and Clara (Jenna Coleman) forced to train an inept band of Vikings to battle advanced alien mercenaries.

"Odin has come to visit his loyal followers, the Vikings, and reward their bravest warriors with a place in Valhalla," revealed co-writer Jamie Mathieson, who penned last year's popular* Doctor Who* episodes,* Flatline* and Mummy On The Orient Express.

"There's only one problem - the Doctor and Clara, who are having none of this and smell a rat. They are soon caught up in the middle of a war between an advanced race of mercenary aliens and a village full of angry Vikings, who don't take kindly to having their Gods insulted.

"There is another big mystery to solve in the form of Maisie Williams, who plays a Viking that the Doctor seems to recognise. But from where? Or is it when?"

Maisie has recently revealed that it was “refreshing” to fuse the “familiar bearded, hairy men setting” with a “futuristic setting”.

"That's what has kept me going really, [that it's] not just beards and dragons," she explained. "There's a whole new element that's fed in.

"It just looks so great with all of us in our Viking outfits, Jenna in her space suit and the Doctor in his cool coat with his crazy sunglasses. It makes for a really cool and interesting dynamic on screen."

Tune into BBC One at 8.20pm this Saturday (17 October) to see Maisie on Doctor Who.