The Composite Superman is a DC Comics supervillain, an enemy of Superman and Batman.
First appearing in World's Finest Comics #142, June 1964, Joseph Meach was a diver who had fallen on hard times. In an attempt to draw publicity to himself, Meach set up a water tank on a sidewalk in Metropolis and dove off a building. Unbeknownst to Meach, the tank was leaking, and Meach would have died if not for the intervention of Superman. The Man of Steel, upon learning of Meach's misfortunes, obtained a job for him at the Superman Museum, where Meach was employed as a custodian. Meach's bitterness did not subside, and being surrounded by artifacts and mementoes of Superman's career directed his anger towards Superman. One night, as Meach was sweeping in front of a series of statuettes depicting the Legion of Super-Heroes, a bolt of lightning passed through an open window and struck the display. The statuettes, which were actually miniature lifeless duplicates of the Legionnaires, unleashed an energy blast that struck Meach. Meach discovered that he was endowed with the combined powers of the Legion members. Determined to defeat Superman, Batman and Robin, Meach used his shapeshifting power to turn his skin green and form a costume that was half Superman's, half Batman's. Calling himself the Composite Superman, Meach told the heroes that if he was not allowed to join their team, he would expose their secret identities, which he learned via telepathy. The Composite Superman then created situations for Superman or Batman to handle, but which he intentionally sabotaged to humiliate the heroes. When Superman and Batman deduced Meach's evil intentions, the Composite Superman forced the team to retire or he would expose their identities. The World's Finest heroes soon discovered that the Composite Superman's intent was to rule the world. Although they were unable to defeat Meach, who used his vast array of powers to keep the duo at bay, the Composite Superman was defeated when his charge of powers turned out to be temporary. Meach reverted to human form with no knowledge of his activities as the Composite Superman.
Composite Superman re-appeared a few years later, in World's Finest Comics #168 (August 1967). An alien villain named Xan came to Earth to avenge his dead father, a criminal who was captured and imprisoned by Superman and Batman. Xan studied the Composite Superman and decided to restore Meach's powers by recreating the accident that endowed him with superpowers. The Composite Superman soon captured Superman and Batman and tried to kill the team. Meach's powers wore off before he could accomplish this though, and soon Xan appeared explaining why he wanted Superman and Batman to die. Xan then fired a lethal energy blast at the heroes but a remorseful Meach intercepted the blast, killing him instantly.
A new Composite Superman appeared in World's Finest Comics #283 (September 1982). Xan escaped from prison and traveled back in time to recreate the event that endowed Meach with his powers, but with himself obtaining the powers. A still-vengeful Xan assumed the identity of the Composite Superman and displayed greater control over his powers and understanding over his weaknesses, such as timing his needed restorations of energy to maintain his power. Xan soon discarded the Composite Superman identity and created an original costume, with the new name Amalgamax. Superman traveled to the 30th century to ask the Legion of Super-Heroes for assistance. Superman, Batman, and the Legion defeated Amalgamax by making him believe that the disease that killed his father had developed in him and that his excessive power was causing the disease to develop rapidly.
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