The JLX are an Amalgam Comics superhero team, consisting mostly of metamutants. They are a combination of DC Comics' Justice League and Marvel Comics' X-Men, and made their first true debut in JLX #1 (1996), though in the Amalgam Universe, their first appearance was in the fictional JLA Annual #13.
The JLX fled to their submarine, the Wavecruiser. Mister X and the Mariner had apparently been doing some mental probing, so that the Mariner could find once more his lost city of Atlantis. When the JLX finally discovered it, it was abandoned, other than the presence of the mutant-hating Will Magnus, Jocasta, and Magnus' Sentinels, giant mutant-hunting robots. After Wraith destroyed Jocasta, they realized they would not be able to defeat the Sentinels. To everyone's surprise, Mister X revealed his true form, the form of a Skrull named J'onn J'onzz. He singlehandely destroyed the Sentinels, and revealed his true origins to the JLX.
The original JLX series only lasted for twelve issues. In the course of the series, the team met up with new mutants, including Kokoro, Sunfirestorm, and Wondercat. An old friend from the JLA joined them as well, Angelhawk finally revealing his metamutant status to the world. During the story called the Dark Firebird Contract, Firebird's Dark Firebird persona was released by Mister Mastermind. Mister X and Niles Cable of the X-Patrol joined forces to pull the Dark Firebird persona back inside her, with great risk to themselves.
In an important story called the Armageddon Agenda, the JLX finally found the true Atlantis. However, the Mariner's reunion with his people short, Will Magnus and his Sentinels were given permission by the government for a fullscale attack against metamutantkind. Half of the population of Atlantis was wiped out, resulting in the Mariner being banished from Atlantis. Mercury returned to the future with the help of Iriskani and Wraith disappeared with the assistance of the Shadow Guild. Firebird was captured by Maxwell Hodge, who released the Dark Firebird persona inside of her once again. The rest of the JLX were captured after the battle, which resulted in Mister X being confined to a wheelchair, Angelhawk having his wings removed by force, and Apollo left in a catatonic state.
Amazon freed the remaining JLX and joined the team, the team now consisting of Mister X, Apollo, his brother Chaos, Nightcreeper, Runaway, Iceberg, and Amazon. The JLX went into battle against Fin Fang Flame, and after a long and destructive battle, Fin Fang Flame was eventually defeated, after Apollo absorbed the energy of Fin Fang Flame, causing a second mutation. With this came the official return of the JLX as a team.
Amalgam Comics superheroes | Superheroes by team | Justice League