Billy Cobb was a professional MMA fighter and the world's most feared MMA fighter. He was played by real life wrestler, Chris Jericho, and his character was meant for a special guest star appearance. He was featured in the episode "Xero Control" and that will most likely be his only appearance. Cobb was drugged and then captured by Xero. The Omega Defiance member hoped to try his super suit on the fighter. Xero's suit would learn all of Cobb's fighting moves as Cobb did them and would then give its wearer the abilities Cobb has.