SHOWTIME Sports^® presents “KINGS OF THE RING: Four Legends of Heavyweight Boxing” featuring legendary heavyweight champions Muhammad Ali, Jack Johnson, Jack Dempsey i Joe Louis. The captivating film-length documentary written and directed by award-winning filmmaker Bud Greenspan, is airing on TEMPS DE LA FUNCIÓ Divendres, Juny 10 a 8 p.m. ET / PT.

“KINGS OF THE RING” explores the lives of four of the greatest heavyweight champions of the 20^º century, who made an impact in history in and out of the ring, advocating for political issues and civil rights. The athletes not only pushed the boundaries by becoming champions, but they also achieved greatness while changing the world in the process.

An encore presentation of “KINGS OF THE RING: Four Legends of Heavyweight Boxing” will replay on SHOWTIME EXTREME on Saturday, Juny 11 a 10:30 a.m. ET / PT. It will also be available on SHOWTIME ON DEMAND beginning Juny 15.