Slow Horses star Christopher Chung will guest star in the upcoming new series of Doctor Who, it has been announced.
The actor - MI5 agent Roddy in the spy drama - will play a character called Cassio Palin-Paleen, joining The Doctor (Ncuti Gatwa) and new companion Belinda Chandra (Varada Sethu) for "a thrilling adventure".
"I'm a huge fan of Slow Horses, and I was so excited to get Chris involved," said showrunner Russell T Davies. "He brings all of his strength and style and talent to one of the darkest, toughest episodes we've ever made.
"As for whether Cassio is an ally or an enemy of The Doctor, you'll have to wait and see, but I can promise, it's one hell of a meeting!"
Chung said: "I'm absolutely thrilled to step into the Whoniverse as Cassio for Season 2! This show is legendary, and getting to be part of this new era feels surreal. Working with Russell and Ncuti has been a dream!
"This episode is huge - packed with everything Who fans love: heart, adventure, and a touch of madness. I can't wait for everyone to see what's in store - it's going to be iconic. Get ready!"
The new series of Doctor Who airs on the BBC in the UK and Ireland and Disney+ in the rest of the world from later this spring.
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