He also announced the "End to Doomsday Predictions". Savage was seen as leader of a doomsday cult. The episode revolved the return of Superman villain Doomsday. Steppenwolf is one of the earliest survivors of Doomsday, the monster who once killed Superman. Darkseid attempted to replicate Doomsday, producing an army of Doomsday "clones". Luthor agrees to help Superman by focusing on evacuating civilians while Superman deals with Doomsday. Christmas Day is always the day before doomsday. Doomsday returned yet again in the miniseries "The Doomsday Wars". Many Acts advance the ultimate goal of constructing the doomsday device. Dexter's investigation of the Doomsday Killers leads him to Travis Marshall. Steel finds himself the only person who can defend Metropolis from an attack by Doomsday. We now compare September 18 to a nearby doomsday, September 5. The Xavier Protocols are a set of doomsday plans created by Professor X. He escapes from Doomsday and then saves a woman named Alexandra Gianopoulos from Doomsday's attack. On 6 September 2017, Architects released a single titled "Doomsday".