When a British actor decides to leave his Hollywood career behind to join the Kurdish YPG in their fight against ISIS in Syria, opinions about his actions are divided. Some view him as a noble hero confronting a major threat to America, while others see him as a volatile narcissist using the situation as a publicity stunt to boost his career. Upon completing his service, he finds himself unwelcome in both the UK and the US. Through insightful interviews with the actor, his supporters, critics, and leading experts, along with gripping helmet-cam footage of intense battles and interrogations of ISIS fighters, “Heval” offers viewers a rare glimpse into the fight against evil and the contentious role this actor plays in it.