Ricky Marvin
In 1998, Fuentes began training in the CMLL wrestling school under Mendoza and Casas, and it was there that he came up with a new ring name, combining his first name, Ricky, and his favorite cartoon character, Marvin the Martian, to create the ring name "Ricky Marvin". As Ricky Marvin, his first appearance at a major CMLL event came at the second "Gran Alternativa" of 1999, where he teamed with his mentor Ringo Mendoza. In the first round, Marvin and Mendoza defeated Apolo Dantés and Alan Stone but lost to eventual tournament winners El Felino and Tigre Blanco in the second round. On July 16, 1999, Marvin teamed with Sombra de Plata, losing to Fugaz and Sangre Azteca in a match that stole the show, earning the four youngsters a standing ovation from the crowd. The success of that match earned all four a match at CMLL's 66th Anniversary show on September 24, 1999. This time, Marvin and Sombra de Plata won the match. Marvin made his Japanese debut on November 23, 1999, defeating Sangre Azteca, who was also making his debut for CMLL Japan. The rivalry continued on March 17, 2000, as Ricky Marvin defeated Sangre Azteca in a three falls match on the undercard of the 2000 "Jucio Final" pay-per-view. While working for CMLL Japan, Marvin defeated Virus to win the CMLL Japan Super Lightweight Champion on August 6, 2000. He held the title once more before the organization ceased operations in early 2001. On November 29, 2000, Marvin defeated Virus, this time to win the Mexican National Lightweight Championship. Marvin held the championship until December 3, 2001, when he lost it to Loco Max.