Arena Naucalpan 21st Anniversary Show

The Arena Naucalpan 21st Anniversary Show was a major annual professional wrestling event produced and scripted by the Mexican professional wrestling promotion International Wrestling Revolution Group (IWRG), which took place on December 20, 1998 in Arena Naucalpan, Naucalpan, State of Mexico, Mexico. As the name implies the show celebrated the 21st Anniversary of the construction of Arena Naucalpan, IWRG's main venue in 1977. The show is IWRG's longest-running show, predating IWRG being founded in 1996 and is the fourth oldest, still held annual show in professional wrestling.

The focal point of the 21st Anniversary show was a 16-man Ruleta de la Muerte (Spanish for "Roulette of death") tournament where the losing teams would advance in the tournament. In the end tag team partners Mega and Judo Suwa were forced to wrestle each other after having lost all three tournament matches. Mega won the Lucha de Apuestas ("Bet match") and as a result Judo Suwa was forced to have all his hair shaved off.