Doomsday is a literal monster, and much to Superman's dismay, he's proven over the decades that he's not just a monster, but ...
Superman has his fair share of darker stories, but many of these need to be avoided in terms of adapting them in the new, bright cinematic DCU.
The showrunners had also Dreamed of introducing one of DC’s most formidable villains: Darkseid ... Yet, true to the comics, Clark was resurrected just a few episodes later.