Claim: Rey Mysterio is a human.

Óscar Gutiérrez -LRB- born December 11 , 1974 -RRB- , better known by his ring names Rey Mysterio Jr , or simply Rey Mysterio , is a Mexican-American professional wrestler . He is best known for his long tenure in WWE from July 2002 to February 2014 . He is also known for his work in Extreme Championship Wrestling -LRB- ECW -RRB- , AAA , and World Championship Wrestling -LRB- WCW -RRB- . Gutierrez was trained by his uncle Rey Misterio , Sr. , learning the high flying Lucha Libre style that has been his trademark .   `` Rey Misterio '' is Spanish for `` King Mystery '' , but subsequently dropped the `` Junior '' from his name when he began working for WWE in July 2002 until February 2015 .   Mysterio is known for having a high flying style , which helped kick-start the cruiserweight wrestling revolution in the United States in the late 1990s during his time in WCW , and is often regarded as one of the greatest high-flyers in wrestling history . In WCW , he won the WCW World Tag Team Championship three times , and the WCW Cruiserweight Tag Team Championship once with Billy Kidman as part of The Filthy Animals . In WWE , Mysterio is a three-time world champion , having held WWE 's World Heavyweight Championship twice and the WWE Championship once . He has also held the WWE Tag Team Championship a record-tying four times , and the WWE Intercontinental Championship twice . All totaled , Mysterio has won 21 titles between WWE and WCW , including a record eight Cruiserweight Championships -LRB- five in WCW , three in WWE -RRB- . He was the 21st person to complete the WWE Triple Crown , and was the winner of the 2006 Royal Rumble .