Long before Kryptonians inhabited their eponymous planet, it was home to a scientist of unknown species named Bertron that repeatedly experimented on an artificial being that was meant to be the most dangerous animal in the galaxy. The idea was that it was sent into battle to be killed, and then upon recreation, would become impervious to the way it was killed before. This alien, branded 'Doomsday', would break out of captivity, kill Bertron and lay waste to his lab as vengeance for experimenting on him in the first place, and then come to Earth at some point. Upon reawakening, it wreaked havoc across its entire journey across America, disposing of the Justice League before coming into contact with Superman. They engaged in a ferocious battle that trashed a good amount of Metropolis, eventually ending up in a draw that cost both their lives. Since then, after Superman’s revival, as expected, Doomsday would come back numerous other times, but was always brought down in a different way.

Since killing him would be next to impossible, Superman devised a collar that allows him to control Doomsday’s movements. Doomsday now serves as a last resort weapon for the One Earth Regime.

Doomsday should sound monstrous and nearly demonic. You may need to refer to the performance by Khary Payton for this character. There will only be about 2 to 3 lines to this character's name, so please be aware that Doomsday most likely will not make an appearance until Chapter 12, the final chapter of this fandub.