Read more about Captain Boomerang at: Wikipedia
Official Site: DC Comics
Secretly the illegitimate son of an American soldier and an Australia woman, Harkness was raised in poverty, during which time he developed great skill in making boomerang, and in using them as weapons. As a young adult, he was hired as a performer and boomerang promoter by a toy company which was, unbeknownst to him, owned by his biological father. Audiences ridiculed him, and a resentful Harkness turned to using his boomerangs for crime.
Although he lacked any actual superhuman abilities, he became a recurring enemy of the Flash, typically by devising altered boomerangs which could produce astonishing effects (some would explode, others had razor-sharp edges, etc.), and using them ruthlessly. He became a staple member of the Rogues Gallery, a group of villains dedicated to opposing Flash.
Throughout the first several years of the character's existence, Captain Boomerang spoke with no discernible accent. Beginning in the late 1980s he developed an Australian accent.
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