In 1989, Pillman returned to the United States and began wrestling for World Championship Wrestling (WCW), where he was known as Flyin' Brian due to his athletic ability and variety of aerial maneuvers. He was one of the first American wrestlers, along with "Beautiful" Bobby Eaton, to incorporate a variety of Mexican lucha libre moves into his arsenal. He held the NWA United States Tag Team Championship with The Z-Man between February 1990 and May 1990. Pillman later feuded with Barry Windham, who he harassed while dressed as the masked Yellow Dog after losing a Loser Leaves WCW (Pillman was eventually reinstated). He also held the short-lived WCW Light Heavyweight Championship twice between October 1991 and February 1992, feuding with Brad Armstrong, Jushin "Thunder" Liger, Richard Morton, and Scotty Flamingo.