Juventud Guerrera, is a Mexican professional wrestler who is best known for his work in many wrestling promotions worldwide, including all the major American wrestling promotions (World Wrestling Entertainment, World Championship Wrestling, Extreme Championship Wrestling and TNA) as well as the major Mexican wrestling promotions (Asistencia Asesoría y Administración and Consejo Mundial de Lucha Libre).

Guerrera is the son of Mexican wrestling legend Fuerza Guerrera.

His cousin also wrestles, under the name Furia Guerrera in Mexico. Guerrera appears as himself in the film Ready to Rumble (2000), although his name is spelled in the credits (and in the closed captioning) as "Juventud Guerrero").

Juvi in WWE
Juventud Guerrera had signed a contract with World Wrestling Entertainment (WWE) in spring 2005. He debuted on television, wrestling simply as Juventud, on June 18, 2005, defeating Funaki on SmackDown!'s sister show Velocity. On June 23, he, Super Crazy and Psicosis (collectively called "The Mexicools") interrupted a match between Chavo Guerrero and Paul London by riding to the ring on a lawn mower and attacking both wrestlers.

This was followed week by week of The Mexicools interrupting matches and beating down seemingly random wrestlers and cutting promos. Juventud quickly established himself as the mouthpiece/leader of the group and began using his old gimmick name of "The Juice".

At the 2005 Great American Bash on July 24, The Mexicools defeated the Blue World Order (Big Stevie Cool, The Blue Meanie, and Hollywood Nova) in a six-man tag team match.

After more weeks of interruptions and sneak attacks, The Mexicools were sent down to the SmackDown! B-show, Velocity. The group feuded with Velocity main-stay and Cruiserwieght Champion, Nunzio and his tag partner, Vito. Members of The Mexicools picked up numerous pin fall victories over the champion during this time.

At the October 4 SmackDown! tapings, for Velocity, Juventud (along with Super Crazy and Psicosis) faced Brian Kendrick, Paul London, Scotty 2 Hotty and Funaki in an over-the-top battle royal with the stipulation that the winner would receive a title shot at the Cruiserweight Championship at No Mercy. After finally eliminating Paul London, Juventud won the battle royal and the title shot. At the event on October 9, he defeated Nunzio following a Juvi Driver to capture the WWE Cruiserweight Championship.

Juventud later went on to lose the title back to Nunzio at a live event in Italy. On November 25 however, Juventud regained the gold on an edition of SmackDown! from England, following a Juvi Driver. Guerrera lost the title to Kid Kash at Armageddon on December 18, 2005.

On January 6, 2006, WWE announced that Juventud had been released from the company. His final match aired that evening on SmackDown!, a Cruiserweight title rematch against Kash which Juventud lost. During this match, Juventud would use many high flying moves - despite WWE telling its cruiserweights to tone down those aerial moves - and the 450 splash, a move WWE outright banned due to an earlier match Juventud had when he messed up the move and ended up fracturing bones in Paul London's face.