Billy Numerous is a villain of the Teen Titans media. He is student of the H.I.V.E. Academy and an enemy of the Teen Titans.
Billy Numerous is first seen as a student of the H.I.V.E. Academy where his power of duplication was subtly hinted. When the Academy was destroyed, Billy Numerous escaped and became a renegade villain.
Later, Billy engaged in a battle with the Teen Titans while he was in a robbing spree all across Jump City. The Titans were subdued by Billy's duplication power, which made Cyborg more obsessed to catch him. Cyborg and the other Titans managed to catch Billy in an old stadium by using holographic projections created and controlled by Cyborg to look like they duplicated themselves. In order to bring the Titans down, Billy created more clones of himself but pushed his power to the limit. The result came when his clones were reabsorbed into him and he experienced a physical and mental shock, stunning him.
At some point, Billy joined the H.I.V.E. Five and was also recruited into the Brotherhood of Evil. When he was with the H.I.V.E. Five, he helped his teammates to attempt to capture Kid Flash but even his numerous clones were unable to stop the super-speedster. When the Brain executed its plans to attack all superheroes, Billy Numerous was sent with Gizmo to capture Kole and Gnarrk, but were both defeated. When the final battle with the Teen Titans started, Billy Numerous attempted to escape with the rest of the H.I.V.E. Five members but was blasted by one of Jinx's hexes and ended up flash-frozen with the other villains.
Billy Numerous has the power to duplicate himself as many times as he wants. All his clones share his personality and his trickery. The exact number of duplicates he can create is unknown but it is shown to be higher than a hundred. However if he creates too many clones, he will experience a physical and mental shock that results in reabsorbing his clones and stunning him.
In 2008, he was added to the main DC universe as an enemy of Catwoman.