but it’s not who you think…

While Maisie Williams has had a starring role in the sci-fi drama as immortal Ashildr, another GoT cast member took their turn in the Christmas Day special.
The evil, head-swapping robot King Hydroflax was played by several people in the episode – including Matt Lucas, Phillip Rhys and Greg Davies.
But the voice of the robot itself was played by actor Nonso Anozie.

Keen Game of Thrones fans will recognise him as Xaro Xhoan Daxos, he was last seen in the second series being locked away in a vault after betraying Mother of Dragons, Daenerys Targaryen.
She sealed him away after he committed a cardinal sin, but the star lended his voice to the character in yesterday’s emotional episode The Husbands of River Song.

The theatre actor’s other credits include the recent Disney blockbuster Cinderella, in which he played Captain, as well as starring alongside Liam Neeson in The Grey and another remake Pan.
He’s already worked with former Doctor Who showrunner Russell T. Davies, in one of 2016’s TV movie A Midsummer Night’s Dream. He will star as Oberon alongside Maxine Peake and Matt Lucas.

Fans were left in tears after watching the Christmas special, the Doctor spent what he seemed to know was his last night with estranged wife River Song .
While he didn’t confirm to the unsuspecting TARDIS pilot that they would never see each other again, it didn’t take her long to realise what was going on – especially after she caught him shedding a tear.

“I don’t always save the day,” the Doctor regretfully told River. “There is no such thing as a happy ever after.”
The tear-jerking moment caused a frenzy on Twitter from those tuning in at home.

Tammie Jade posted: “Doctor who just killed me tears are real!”
Vanessa Green then commented: “Beautiful, heart warming and heart breaking. Loved this years Doctor Who Christmas special.”

Another fan tweeted: “That was the first time in forever i’ve watched doctor who the entire way through and not been confused. AND I REALLY ENJOYED IT OKAY!”
On the bright side for the Doctor and River, one night in Derilium is the equivalent to 24 years to the rest of the world.