Fan Casting Worldkiller-1 in Return to the DC Universe

The first of the Worldkillers, Worldkiller-1 wasn't a genetically modified alien lifeform, but the Kryptonian Empire's attempts to create a lifeform that was capable of symbiosis. They succeeded, with Worldkiller-1 being used to make symbiosis with the soldiers of the Empire, but would eventually kill them. When saved by Harvest, Worldkiller-1 was enhanced by the Dominator, allowing him to exist without symbiosis, but also assimilating the abilities of other races, which has made him a formidable leader to his fellow Worldkillers as Harvest's enforcers.