It was shocking and extraordinary for fans of 'The Voice' when Usher showed up as a Mega Mentor.
Usher, a former "The Voice" coach, made a special appearance on Tuesday night. The show started the Knockout Rounds with all regular coaches, Gwen Stefani, Blake Shelton, John Legend, and Kelly Clarkson.
Usher returned as a Mega Mentor and fans were simply stoked to see him on the show. The singer previously served as a coach on Seasons 4 and 6 of the show.