Psicosis was one of the greatest high flying cruiserweights of the 1990s. He began wrestling in Mexico after being trained by Rey Mysterio Sr. (Rey Jr.'s uncle). He made a name for himself there in Mexico and began a long feud with Rey Mysterio Jr. His first step into major success came at the 1995 Super J Cup, a very prestigious, high-flying tournament held every year. His non-tournament match with Rey Jr stole the show and became the third runner up for PWI Match of the Year. Psicosis also spent some time in ECW at this time, having some more excellent matches with Rey Jr.His jump into the limelight came in 1996 when he, along with a host of other Mexican wrestlers, made their way over to the high-profile promotion WCW. WCW was fast becoming the best wrestling promotion in the world, and a large part of that was due to this influx of unknown foreign talent, of which Psicosis became one of the most well-known. He once again wrestled Rey Mysterio Jr on one of his first Pay Per View events, Bash at the Beach 1996. He spent the next two years putting on excellent matches with the likes of Billy Kidman, Juventud Guerrera, Chris Jericho, Eddie Guerrero, and, of course, Rey Mysterio Jr. This group of cruiserweight wrestlers often stole the show, whether it was Monday Nitron on TNT, Thursady Thunder on TBS, or one of WCW's high-profile Pay Per View Events. His greatest achievement in WCW was winning the Cruiserweight Title on April 19 1999 on Monday Nitro in a four-way match against Rey Jr, Juventud Guerrera, and Blitzkrieg. He only held the title for a week, however, as he lost the title on the following edition of Nitro. He was unmasked in a match later in the year with Kidman and then spent a few more months wrestling off and on.He left WCW in 2000 and went back to the rings of ECW. He wrestled there for about a year and then spent some time wrestling on the intercontinental circuit with the WWA.