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‘Slow Horses’ Actor Jack Lowden Unpacks River Cartwright and Why Pride Gets in His Way

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CitrixNews Staff
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‘Slow Horses’ Actor Jack Lowden Unpacks River Cartwright and Why Pride Gets in His Way
Aug 19, 2026 10:45am PT ‘Slow Horses’ Actor Jack Lowden Unpacks River Cartwright and Why Pride Gets in His Way

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Jazz Tangcay

Artisans Editor

@jazzt See All Jack Lowden AppleTV+

It’s fair to say that when audiences see River Cartwright at the beginning of Apple TV’s “Slow Horses” Season 5, he is not in a good place. The previous season revealed that River’s father, Frank Harkness (Hugo Weaving), is both a sociopath and the leader of a network of trained assassins. It was also revealed that Frank had fathered numerous sons and raised them to carry out his hits.

“I think for anybody, that would be quite traumatic,” says Jack Lowden of his character River’s damage, which carries into Season 5; his base of operations, MI5’s Slough House headed by Gary Oldman’s Jackson Lamb, has become a bit too much for him.

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