Wrestling legend Rey Mysterio made his Lucha Underground debut during a television taping of the Lucha Libre series Saturday in Los Angeles, the promotion announced in a press release.

Mysterio, a former WWE World Heavyweight champion and arguably the most popular Mexican luchador of all time, is the biggest signing to date for Lucha Underground, which is entering its second season on the El Rey Network. The second season is slated to premier Wednesday, Jan. 27 at 8 p.m.

"When it comes to in-ring performers, Rey Mysterio is among the elite and we are thrilled to welcome him and his skills to the Lucha Underground franchise reinforcing our promise to bring U.S. audiences the very best in lucha libre wrestling," Lucha Underground's executive producer and showrunner, Eric Van Wagenen, said in the release.

"I'm excited by the opportunity to join such an extraordinary group of athletes and be a part of the Lucha Underground family," Mysterio said in the release. "It is a privilege to be able to represent this sport and have a chance to share my love of Lucha with passionate wrestling fans around the globe."