“Slow Horses” Actor Christopher Chung Joins Season 2 of “Doctor Who”

The actor will portray Cassio in “one of the darkest, toughest episodes ever made.”

Slow Horses actor Christopher Chung is set for an appearance in season 2 of Doctor Who.

What’s Happening:

Australian actor Christopher Chung is joining the cast of Doctor Who as a character simply known as “Cassio."
He’ll meet the Doctor (Ncuti Gatwa) and his new companion Belinda Chandra (Varada Sethu) for a thrilling adventure in the forthcoming second season – described by showrunner Russell T Davies as one of the “toughest episodes we’ve ever made."
In addition to his role opposite Gary Oldman in Apple TV+’s Slow Horses, Chung has also appeared in the BBC’s Waterloo Road and the Steve McQueen 2024 movie, Blitz.
Doctor Who returns to Disney+ in 2025 for some explosive new adventures, with old and new friends alike.

What They’re Saying:

Showrunner Russell T Davies: “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: “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!"

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