Guerrera is best known for his appearances with the Mexican professional wrestling promotions AAA and Consejo Mundial de Lucha Libre (CMLL) and with the American professional wrestling promotions Extreme Championship Wrestling (ECW), World Wrestling Entertainment (WWE), World Championship Wrestling (WCW), and Total Nonstop Action Wrestling (TNA). Championships held by Guerrera over the course of his career include the AAA Cruiserweight Championship, IWGP Junior Heavyweight Championship, WCW/WWE Cruiserweight Championship, WCW World Tag Team Championship, and WWA International Cruiserweight Championship. "Juventud Guerrera" is Spanish for "Youth Warrior".