
Chung, best known as MI5 agent Roddy in Slow Horses, has also starred in Steve McQueen’s BLITZ and played Kurt Kelly in Heathers: The Musical on the West End. Now, he’s taking on a new challenge in Doctor Who, playing a character named Cassio—though his true allegiance remains a mystery.
Showrunner Russell T Davies teased: ‘I’m a huge fan of Slow Horses, and I was so excited to get Chris involved. 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 himself is just as excited, saying: ‘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!’
With Davies promising one of the darkest episodes yet and Chung hinting at an unforgettable adventure, fans are in for a treat. Will Cassio be friend or foe?
Doctors Who returns this spring on BBC One
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