Captain Boomerang was an enemy of the Flash and a member of his Rogues gallery that used his mastery of boomerangs to commit crimes.
After Batman teleported an alternate reality Justice League to help fight the Regime, Captain Boomerang was contacted by his former Suicide Squad teammate Harley Quinn, who asked if he would join her Joker Clan resistance against the Regime. Boomerang declined, preferring to continue working as a solo thief with all his competition imprisoned. 
- 16 Appearances of George Harkness (Injustice)
- 2 Images featuring George Harkness (Injustice)
- Quotations by or about George Harkness (Injustice)
- Character Gallery: George Harkness (Injustice)
Suicide Squad member