While the 2004–05 season was cancelled due to a labor dispute, Regehr played in a European charity tour that saw NHL players form a "Worldstars" team that played ten games in seven countries in December 2004. While he enjoyed the tour, Regehr stated that he was not interested in joining the many other NHL players who signed on with European teams during the lockout. He was also critical of the position of the league in the lockout, and took on a greater role within the National Hockey League Players Association (NHLPA) when he succeeded Jarome Iginla as the Flames player representative following the lockout.