Doomsday was an enemy of Superman.
Biography
At some point, Doomsday faced Superman but the latter ended up victorious, though the battle wasn't easy.[1]
Appearances
Supergirl
Season 5
- "Crisis on Infinite Earths: Part One" (mentioned)
Behind the scenes
- In the comics, Doomsday was the product of a Kryptonian genetic experiment created by an ancient Kryptonian scientist named Bertron during the Last War of Krypton, producing a deformity with unfathomable stores of power and capacity for destruction. He is best known for murdering Superman in the "Death of Superman" storyline.
References
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