Watch Series: The Kings Released in (2021) - Season 1 produced by USA, The TV Series categorized in Documentary, Sport, and content rating Documentary, Sport with duration 60 min broadcasted as these networks ABC, Streamed at Putlocker A four-part series featuring four champions who ushered in a boxing renaissance. The series showcases the dominance of Roberto Duran, Marvelous Marvin Hagler, Thomas Hearns and Sugar Ray Leonard and their battles in and out of the ring. - Season 1