Owen Mercer is the son of the original Captain Boomerang, but did not know his father's identity until Mercer was an adult. The two practiced together, and were surprised when Mercer found he had bursts of super speed. When his father died he was invited to join the Rogues, but later left for stints with the Outsiders and the Suicide Squad. He later returned, but was kicked into a pit occupied by his Black Lantern reanimated father by the Rogues for violating their "no killing women or children" rule. He was then killed by his father