Captain Boomerang (full name George "Digger" Harkness) is an antagonist in the DC universe, first appearing in the Identity Crisis #3 comic strip, as a rival of the Flash. An Australian thug and smuggler, who uses a variety of high-tech boomerangs, as weapons of choice, (hence his name), Captain Boomerang has been involved in various villainous organizations, including the Injustice Gang, the Secret-Society of Villains, the Green Lantern Corps, and the Suicide Squad. He briefly appears in the Non-Disney vs. DC Villains War.
Non Disney Vs DC Villains War
Captain Boomerang is amongst the prisoners of the Belle Reve facility, as he is treated by his new and harsh supervised enviroment of the facility.