Showrunner Steven Moffat meanwhile is, predictably, keeping his cards close to his chest: “There’s a very unique, interesting young/old quality there that just fitted in beautifully with what we were looking for,” he said of the actress best known as Arya Stark from Game of Thrones. “But beyond that, you’ll have to watch and see.”
Is that a hint that her character has experience beyond her youthful looks? Her line, “What took you so long old man?” suggests she’s been waiting quite a long time for the Tardis to drop out of the sky.
One thing’s for sure, both Capaldi and Moffat were both bowled over by how mature she was on set.
“She is fantastic. She’s such a gifted actress,” said Capaldi. “The reason I’m saying that with awe is because she’s so young. She turned 18 while she was working with us, and she came in and she did a performance that I thought was so mature and so clever.”