At the beginning of 2001, the Filthy Animals feuded with Team Canada, to whom they lost in a Penalty Box match at Sin. At SuperBrawl Revenge, Mysterio unsuccessfully challenged Chavo Guerrero Jr. for the Cruiserweight Title. Kidman and Mysterio participated in a Cruiserweight tag team tournament for the newly created WCW Cruiserweight Tag Team Championship and advanced to the final round where they ended up losing to Elix Skipper and Kid Romeo. On the final episode of "Nitro" on March 26, they defeated Skipper and Romeo in a rematch to win the Cruiserweight Tag Team Titles before WCW was sold to the World Wrestling Federation (WWF).