Superman Volume 1 #149: The Death of Superman
The supporting cast
- In Superman #65 (1950), the Man of Steel comes upon Kryptonian survivors for the first time... three outlaws who attempted to blackmail their way into ruling the planet by making the atmosphere unbreathable.
- In Action Comics #402 "Feud of the Titans", Superman and Supergirl are accidentally exposed to a bio-chemical weapon which makes them hate each other. This story is both hilarious (both cousins are incredibly and ridiculously petty) and scary (imagine they—two Earth-1 Kryptonians—decide to fight seriously. They would tear the planet apart).
- Adventure Comics #408 -titled "The Face At The Window"- is a bona fide ghost story: an old mansion owned by a happy-trigger old man who hates visitors, a mysterious little girl wandering over the halls in the dark and requesting to help her find her parents, and corpses murdered and hidden in the basement by the house-owner several decades ago. Reviewed here.
- In Superman Family #178 "The Girl with the Heart of Steel", Lois Lane is given bionic body parts, and as an unintended side-effect her entire body slowly becomes entirely robotic; the results are unsettling, to say the least.
- In Superman (Volume 1) #414 "Revenge Is Life — Death To Superman!", Superman takes his cousin's body to Rokyn. When he lands, his uncle and his aunt usher him in asking what is that cloth-wrapped bundle he's carrying. Readers don't see their reaction but they can hear their cries.
- The Alternate Zod's genocide of the entire planet at the end of The Supergirl Saga. We only see bits of it in flashback, but it's just as horrific as one can imagine.
- Action Comics #775: "What's So Funny About Truth, Justice, & the American Way?": The Elite are, indeed, Anti Heroic assholes who have no problem killing their enemies and blow off Big Blue for being so behind the times. Superman appears to agree with them, and proceeds to take them out one by one in some incredibly chilling methods, before using a very restrained use of his powers to de-power Manchester Black. And show him that he actually didn't kill The Elite, just made it look like he did to prove a point — if he allowed himself to adopt '90s Anti-Hero tactics, the whole world would be screwed and never trust caped heroes at all.
- After the events of New Krypton, Supergirl has a nightmare in which she's fighting Superwoman again. Then Superwoman's flesh melts off her face and she becomes a skeleton. All of sudden, Kara finds herself in a hellish landscape, surrounded by flames and skeletons. Her dead mother accuses her of letting them die, and her murdered father wants to take her with them.
- Shortly later Bizarrogirl threatens to eat Jimmy Olsen. She may not understand the implications of this threat, but the sight of a defective, irrational Kryptonian grabbing your collar, pulling closer to her face and showing her glowing-red eyes and her flame-spewing mouth while she announces that you're going to be her meal...
- The fact that Lex Luthor has a point: in Real Life, having a super-duper-powered extraterrestrial being hovering around, of whom we know only what he wants us to know however generous, with exclusive access to alien technology and capable of imposing his will upon humans at very least is actually frightening, no matter whatever good will Superman has towards Earth. The guy can even destroy the planet by accident. As Superman: Red Son and Injustice: Gods Among Us can attest, if he wanted to Take Over the World, it would be very, very, hard to stop him. Triple points when we take into account that Luthor is not even considering that Superman hides among us...
- Everything about Doomsday, including but not limited to...
- His first appearance: In The Death of Superman, Doomsday just shows up out of absolutely nowhere and goes on a killing spree for seemingly no reason. The Justice League arrive to stop him... and he beats them all up solo, even with one of his hands still restrained. Superman was forced to fight him, and it wasn't the Curb-Stomp Battle people were hoping for in-universe. In the end, it culminated in a brutal Duel to the Death that ended with a Mutual Kill. Yes, Doomsday accomplished what Luthor, Brainiac and Zod couldn't: he killed Superman. And he didn't need Kryptonite to do it, either.
- His powerset: Every time Doomsday dies, he comes back to life. And thanks to his Adaptive Ability, whatever killed him before will not work again. This has given him a biology to fear; Super Strength, Nigh-Invulnerability with a Healing Factor on top of that, the ability to cross vast distances by jumping, bone-like protrusions that make it hazardous to fight him up close and a complete lack of dependency on food, drink or even breathable air, among other things. Not even Darkseid's Omega Beams can keep him down forever. Now that's terrifying. But not as terrifying as how he got that ability in the first place...
- His backstory: Superman/Doomsday: Hunter/Prey showed us how Doomsday came to exist. Short version, Dark and Troubled Past doesn't even begin to describe it. Long version, he first came into being as a Designer Baby created as part of an alien Mad Scientist called Bertron's experiments to create the Ultimate Life Form. The process of the experiments was to send him into the perennially hostile environment that was prehistoric Krypton, where he was subject to countless Cruel and Unusual Deaths followed by clone-induced rebirth and rehashing. He was torn apart by indigenous beasts, had his lungs burned out by the red-hot atmosphere, got poisoned, and died in who knows how many other ways until he finally learned to stop dying by such means. And not only was this an ongoing process for more than thirty years, but Doomsday remembers every single moment of his suffering. The resulting trauma has burdened him with a hatred and fear for all living things, but especially Kryptonian lifeforms, and unintentionally implanted an impetus to kill every living thing he came across because he genuinely believes that's the only way he can be safe.