Digger Harkness was a poor Australian boy skilled at throwing a boomerang. When he tried to make a living demonstrating his skills, he was laughed at by audiences. Resentful and desperate, he turned to crime, calling himself Captain Boomerang. He became an archenemy of the Flash and joined the supervillain groups The Rogues and Suicide Squad. One taste of his razor-edged or exploding boomerangs, and no one is laughing anymore.

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