Rey first started training at the age 15. At age 16 he was wrestling in churches for the fans in mexico. Rey got his first big break in AAA were he'd win the welterweight title. Later he would go to ECW.Rey would only be in ECW for a year where he wouldn't win any titles. After the year of extreme,Rey later went to WCW where he would many cruiserweight titles. In WCW Rey beat many giants such as Kevin Nash and Scott Hall.

Rey after his many successful years in WCW,Rey decided to go to the WWE(WWF). Mysterio would win the World title once,the tag titles five times,and by this time the cruiserweight title seven times. To get to his world title shot Rey won the 2006 royal rumble. Later losing his shot to Randy Ortan,Rey would later get his shot back but this time in a triple threat match between Rey Mysterio,Randy Ortan,and Kurt Angle. Were Mysterio would be successful on accomplishing his dream and becoming World champ.Rey would lose his title to Booker T. Because Chavo Guerreo helped Booker win. Rey would later have to face Chavo in an "I QUIT MATCH" where Rey would lose. In six months Rey would face Chavo again in another "I QUIT MATCH" where Rey would finally defeat his rival.

That same year he got a world title shot.It would go on to be Rey Mysterio vs Batista vs The Great Khali.Rey didn't win but he held his own,because he got another shot.It would be Edge vs Rey Mysterio for the World title.Rey had the match won until Vicky Guerreo cheated for her soon to be husband,Edge.Mysterio had the match won,until Vicky came out and cheated.

The WWE thought that shouldn't have happened.Rey went for the title,but this time he has an injured bicep.He wil be out for six to eight weeks.The doctor says he recovers quickly.