General Zod and Doomsday are not the same. General Zod is a Kryptonian villain with his own distinct traits and motives, while Doomsday is a powerful and destructive creature. They have different origins and storylines in the comic universe.
Doomsday in comics is usually portrayed as something that threatens the entire existence of the fictional world. It could be the result of a villain's master plan or a cosmic imbalance. The imagery and storyline associated with it aim to create a sense of impending doom and urgency for the characters to overcome.
Indeed, Doomsday managed to kill Superman in the comics. It was a dramatic and unforgettable scene that changed the course of the story. Many thought Superman was gone for good, but as comics go, there's always a twist.
Doomsday's backstory involves being subjected to extreme genetic manipulation and torture. This made him incredibly powerful and vengeful. He emerged as a force of pure destruction.
Doomsday was created through a combination of genetic engineering and harsh experimentation. It was a product of a desperate attempt to create the ultimate weapon.