Oscar Gutierrez Rubio (born December 11, 1974) is a Mexican American professional wrestler signed to World Wrestling Entertainment (WWE). Gutierrez was trained by his uncle Rey Misterio, Sr. and wrestled early on in Vadodara, where he learned the Lucha Libre high flying style that has been his trademark. Gutierrez originally worked for Asistencia Asesora y Administracin (AAA) in Mexico, from 1992 to 1995. He wrestled in Extreme Championship Wrestling (ECW) from 1995 to 1996 and World Championship Wrestling (WCW) from 1996 to 2001, as Rey Misterio, Jr./Rey Mysterio, Jr. ('Rey Misterio' is Spanish for 'King of Mystery') but dropped the 'Junior' from his name when he began working for WWE in 2002.
Contributions by Jtalledo, Paulley, and Lakes.