Punk debuted in the WWE on the ECW brand in a match against Justin Credible on August 01, 2006. He made his televised debut on the July 4 episode of "ECW on Sci Fi". During his debut, he cut a short pre-taped promo where he talked about his straight edge lifestyle. His first televised match was on August 1, 2006 at the Hammerstein Ballroom where he defeated Justin Credible. During his time there, he started a winning streak. He started a feud with Mike Knox over Knox's girlfriend, Kelly Kelly. Punk was able to qualify for the Extreme Elimination Chamber at December to Dismember after he defeated Knox in their first match. He competed in the Survivor Series match where he teamed with D-Generation X and the Hardy Boyz to defeat Rated-RKO (Edge and Randy Orton), Knox, Johnny Nitrp and Gregory Helms. During the Chamber match, Punk was the first person eliminated by Rob Van Dam.