In August 2011, he quit CMLL and joined Perros del Mal Producciones under the more extreme ring name Doctor X-Treme.

Throughout his career, Doctor X's real name and personal life was not a matter of public record, as is often the case with masked wrestlers in Mexico.

In early 2003 Doctor X began a storyline feud with Tigre Blanco, the reigning Mexican National Welterweight Champion at the time.

[8] On 25 March 2005 Doctor X teamed up with fellow Pandilla Guerrera members Sangre Azteca and Nitro to defeat El Felino, Safari and Volador Jr. to win the Mexican National Trios Championship.

[13] In 2007 most members of Pandilla Guerrera broke away from Los Guerreros del Infierno, wanting to break out of their shadow and move up the rankings themselves.

He was the fifth person to escape the cage keeping his mask safe, the final saw Pólvora pin Tigre Blanco to unmask him.

[16] Dr.X took then part in a 12-man cage match on Christmas day of 2010 in Arena Neza including both CMLL and independent luchadores, winning the mask of Hermano Muerte III.

[18] On October 11, 2011, Valencia was shot in the head and killed when he tried to break up a fight while attending a religious party in Santa María Aztahuacán, Iztapalapa, Mexico City.