 Once his stint with CMLL ended in 2004, Bestia Salvaje made regular appearances for IWRG.He was one of 10 wrestlers to risk their hair or mask in IWRG's 2005 "El Castillo del Terror" event, where he kept his hair safe while Masada defeated Cerebro Negro.A month later he defeated Cyborg in a "Lucha de Apuestas" match, leaving him bald as a result.