Devil worshippers, looking to give Satan the perfect son, began the Blackheart Project. They mated some of the vilest individuals in different combinations, hoping to find the right mix to breed the Antichrist. They finally succeeded, but in doing so, they caught the eye of Zadkiel – a betrayer of God and usurper of Heaven. Zadkiel wanted to slay the Antichrist so the apocalypse would never come to pass, and he would remain forever. The Black Host made quick work of his enemies and just about every man, woman and child were massacred except for his intended target.
Kid Blackheart settled in New York, but he couldn't stay hidden forever. Subjected to another assassination attempt, he would have perished if not for Jaine Cutter and her Breathing Gun. Jaine and the Antichrist fled but were again trapped by a group of mindless minions. Hellstorm, also tracking the boy so he might kill him, ended up having no choice but to defend him from his attackers. Kid Blackheart ran but didn't get far because the arrival of Daniel Ketch. Snatching the boy from the streets and delivering him back to his saviors, Ketch wasn't surprised to see his brother, Johnny Blaze, and his Caretaker already in their company. Ketch explained how he made a deal with the devil to keep the boy safe in exchange for the keys to Heaven to stop Zadkiel.
The group split up and the Antichrist played along, staying close to Sara, the Caretaker. When Jaine Cutter and Hellstorm were assaulted by Madcap and Scarecrow, he and Sara became separated from them. Taking refuge in a deconsecrated church, Kid Blackheart decided to reveal his true goal. Master Pandemonium ambushed Sara, knocking her unconscious, so she could be chained and bound. The Antichrist then said a few words in an unintelligible language and exposed Sara for what she truly was – a gateway to Heaven. Kid Blackheart, seeking to destroy Heaven for his father, led a horde of demons through her and into the shining city. Too bad once he arrived there was an army of Ghost Riders waiting on the other side. His troops didn't stand a chance, and he was forced to flee, but not before suffering a few blows from Knuckles O'Shaugnessy. Kid Blackheart met with Master Pandemonium and Blackout for a some rest and relaxation before they made another go at conquering the world for Satan.