Heavyweight Championship to Aquarius and then regained it 8 days later. The title change was not sanctioned by CMLL and not officially recognized in Mexico. In 1997 he participated in Best of the Super Juniors IV, where he defeated Doc Dean and Chavo Guerrero Jr. but lost the remaining four matches and failed to advance. The following year Dr. Wagner Jr. was invited back for the 1998 Best of the Super Juniors tournament. He won his block with a total of four victories, but lost in the finals to Koji Kanemoto. Later that same year he teamed up with Kendo Kashin to compete for the newly created IWGP Junior Heavyweight Tag Team Championship, losing in the tournament final to Shinjiro Otani and Tatsuhito Takaiwa. When Dr. Wagner Jr. returned to Japan in 1999 Wagner and Kashin won the junior heavyweight tag team championship on January 4 on NJPW's Wrestling World 1999 in the Tokyo Dome. The following month Dr. Wagner Jr. unsuccessfully fought Jyushin Thunder Liger for the IWGP Junior Heavyweight Championship. The reign with the IWGP Junior Heavyweight Tag Team Championship ended after 96 days, with two successful defenses, before losing the belts to The Great Sasuke and Jyushin Thunder Liger on April 10, 1999. For the third year in a row Dr. Wagner Jr. competed in the annual Best of the Super Juniors tournament, a tournament won by Dr. Wagner Jr.'s former partner Kendo Kashin. In 2003 Dr. Wagner Jr and his brother Silver King toured with All Japan Pro Wrestling (AJPW) instead of NJPW, working primarily as a tag team for the entirety of the tour. Lucha Libre AAA Worldwide (2009–2013) On March 15, 2009 Dr. Wagner Jr. made a surprise appearance at Lucha Libre AAA Worldwide (AAA)'s annual Rey de Reyes ("King of Kings") event. First he chased off La Legión Extranjera before turning around to challenge the AAA Mega Champion El Mesias to a title match. On June 13, 2009, at Triplemania XVII Wagner defeated Mesias to win the AAA Mega Championship. After his title win Wagner went on to form the stable Los Wagnermaniacos with Silver King, Electroshock and Último Gladiador. Dr. Wagner Jr. successfully defended the Mega championship against both El Mesias and Cibernético in a Steel Cage Match at the 2009 Verano de Escandalo ("Summer of Scandal") show. At the subsequent AAA event, Heroes Inmortales III, Dr. Wagner Jr. successfully defended against