Demetrious Johnson

Demetrious Johnson. Actor: ONE Championship on TNT. Demetrious Johnson is an American mixed martial artist. Johnson began his career in mixed martial arts (MMA) in 2007 and won his professional debut via first-round knockout. Johnson then appeared on multiple local shows and won his next 8 fights, including four in a row by submission. Johnson fought at the Alaska Fighting Championships in Anchorage and won via head kick KO, which...