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Watched All 5 Seasons of Line of Duty on Hulu? There's a New Cast For Season 6
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Martin Compston as DS Steve Arnott

Martin Compston is once again joining the cast of Line of Duty to portray DS Steve Arnott. His character was recruited to anticorruption during season one, after he refused to participate in a police cover-up following a bungled antiterrorism operation.

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