Real Name: Joseph Meach
Occupation: Criminal
Marital Status: Single
Base of Operations: Gotham City
Height: N/A
Weight: N/A
Eyes: N/A
Hair: N/A
First Appearance: World's Finest Comics #142 (1964)
Created By: Edmond Hamilton Curt Swan

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 and Batman, 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. 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 back to human form with no knowledge of his activities as the Composite Superman.