Best known as MI5 agent Roddy in Slow Horses, Christopher Chung is joining the Whoniverse, meeting the Doctor (Ncuti Gatwa) and Belinda Chandra (Varada Sethu) for a thrilling adventure in the upcoming second season of Doctor Who, which will air this year.

Chung is an Australian actor making waves in the world of TV, film and theatre, most recently seen as the tech-savvy M15 agent Roddy Ho in spy thriller Slow Horses, where he’s been appearing alongside Gary Oldman since 2022. He has also recently starred as Fred in Steve McQueen’s Blitz. His West End credits include Kurt Kelly in Heathers: The Musical.

Russell T Davies, Showrunner says: “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!”

Christopher Chung, says: “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 series is produced by Bad Wolf with BBC Studios for the BBC and Disney Branded Television, and will air on BBC One and BBC iPlayer in the UK, and exclusively on Disney+ outside of the UK where available.