In WWE, Mysterio won the Cruiserweight Championship three times the World Heavyweight Championship and Intercontinental Championship twice, and the United States Championship three times. He also won the WWE Championship once and the WWE Tag Team Championship four times. He is WWE's 21st Triple Crown and Grand Slam champion, is a Royal Rumble match winner, and has headlined several WWE pay-per-view events. Mysterio left WWE in 2015 and wrestled for New Japan Pro-Wrestling (NJPW), Lucha Underground and AAA. Mysterio returned to WWE in 2018. He won the U.S. Championship twice and the SmackDown Tag Team Championship. His tag team partner was his son Dominik.