When a British-born actor abandons his Hollywood career to volunteer to Join the Kurdish YPG to fight ISIS in Syria, many see him as a selfless hero battling America's most insidious enemy. But others think he's a hot-tempered narcissist, staging a publicity stunt to further his career - and when his service ends, neither the UK nor the US welcome him back. Through incisive interviews with the actor, his supporters, his detractors, and top-tier experts - and featuring the actor's own jaw-dropping helmet-cam video of deadly battles with and interrogations of ISIS fighters - Heval gives viewers unprecedented access into a war against evil and one man's controversial role in it.

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