At the beginning of 2006, Chris Hero, a representative from Combat Zone Wrestling (CZW), invaded ROH and targeted Danielson—the two exchanged words over the Internet before having a match together, with nearly the entire roster of both companies embarking on an interpromotional feud. Danielson became personally invested in this feud and invaded CZW himself, which led to him having physical altercations with a number of CZW wrestlers. Hero intensified the rivalry, leading to the two wrestling at ROH's Hell Freezes Over event, where Danielson successfully defended the ROH World Championship. On July 15 at Death Before Dishonor IV, he soon filled the vacant slot on ROH's five-man team which participated in one of CZW's more popular attractions, a steel cage match called the Cage of Death, a ten-man tag team match in which a man from each team starts in the cage and a random wrestler enters periodically thereafter. During the match, Danielson turned on his team by assaulting his rival Samoa Joe before leaving the match and effectively abandoning his involvement in the animosity between the two promotions. As the interpromotional hostility with CZW heightened, Danielson also defended against challengers from the rival company, who had signed an open contract for any CZW wrestler willing to challenge for the ROH World Championship. Former champion Samoa Joe also challenged Danielson at Fight of the Century on August 5, but their match ended in a 60-minute draw.