. "Batman: Assault on Arkham"@en . . "Captain Boomerang (Arkhamverse)"@en . "Captain Boomerang (real-name George Harkness) is an Australian-born criminal operating within Gotham City, who specializes in throwing objects similar to a boomerang, as well as a veteran member of the Suicide Squad."@en . . "George Harkness"@en . . . "Captain Boomerang (real-name George Harkness) is an Australian-born criminal operating within Gotham City, who specializes in throwing objects similar to a boomerang, as well as a veteran member of the Suicide Squad."@en . "Captain Boomerang"@en .