Knockout first appeared shortly after Superboy moved to Hawaii. Using her superstrength, she fought and flirted with Superboy just for the fun of it. Her hidden identity was that of a super strong stripper who worked at a club called the BoomBoom Room. Later, she was recruited to join Amanda Waller's Suicide Squad for an attack against the international crime cartel Silicon Dragons. She joined Captain Boomerang, Deadshot, Sidearm, and King Shark on the Suicide Squad. The Suicide Squad had to overcome betrayal and overwhelming enemies, and in the end, Knockout was supposedly killed when the Squad left her and King Shark in the exploding base. She later returned alive, and assisted Superboy in a battle against Valor, although she and Superboy did spar. She turned up shortly thereafter and teamed up with Superboy in several of his adventures. Soon, however, her past caught up with her. She was originally from Apokolips, a former member of Granny Goodness's Female Furies. After Big Barda escaped with Mister Miracle, Knockout decided to leave the Furies as well. At one point when she was chained to a wall in the Fire Pits as punishment, she broke her chains and leapt into the fires. As she did so, a Boom Tube opened and took her to Hawaii.