No-kill rule.

“Superman never kills” is one of the best-known facts about him, but it isn’t quite true. The rule has a starting point, a few famous exceptions and a long-running fan debate.

The no-kill rule over time

The 1940-or-1941 date rests on secondary sources: Ellsworth’s own Wikipedia biography doesn’t mention the policy, so we label the year disputed.

Why the rule matters

What began as an editorial rule became the core of his character: Superman is strong enough to rule the world, and chooses not to hurt anyone. Each time he has killed, the story treats it as a terrible failure rather than a victory. Read more in Superman’s personality.

The best argument for the rule is Action Comics #775 (March 2001), by Joe Kelly. Superman faces the Elite, a team led by Manchester Black. He appears to kill them, to show where vengeance leads, then reveals that he only faked it. It was adapted as the animated film Superman vs. The Elite (2012), and it’s on our Superman comics reading order.

Zod in Man of Steel

The best-known screen exception is Man of Steel (2013), where Henry Cavill’s Superman snaps Zod’s neck at the end of their battle. Cavill has explained the scene in interviews, but it still divides fans. See where it fits in Superman films in order.

Why it’s also his biggest weakness

Villains know he won’t kill them, so they survive and come back. That’s why we list his moral code among his weaknesses. In Sacrifice (2005), when Maxwell Lord takes control of his mind, it’s Wonder Woman, not Superman, who makes the lethal choice.

James Gunn’s view

James Gunn, who directed Superman (2025), has said he isn’t a purist about the rule. His Superman would kill only if he had to, to protect someone’s life.

Evil Supermen: who they are

The main Superman has never turned evil. Every famous evil Superman comes from another world, a video game, a cartoon or an impostor, and these stories work precisely because they break the rule.

Injustice: why Superman turned evil

In Injustice: Gods Among Us, the Joker tricks Superman into killing a pregnant Lois, and a nuclear blast destroys Metropolis. In grief and rage, Superman kills the Joker and sets up the Regime, forcing peace on the world. In the game he also kills Shazam, who objects to his plans and mentions Lois (Likely; we haven’t checked the comic’s version). It’s the best-known evil Superman, but it’s an alternative world, not the main DC continuity.

The Justice Lords

In the Justice League cartoon episode “A Better World”, an alternative Lex Luthor becomes President and kills the Flash. That world’s Superman kills Luthor, and the Justice League become the Justice Lords, ruling as dictators. DC later placed their world on Earth-50 (Multiversity Guidebook #1, 2015).

Ultraman, from Earth-3 to 2025

Ultraman began in 1964 as the evil Superman of Earth-3. Superman (2025) reinvents him as a clone made by Lex Luthor, played under a mask by David Corenswet himself. See our Superman (2025) guide for the full story, with spoilers clearly marked.

Impostors, not the real Superman

Cyborg Superman and Superboy-Prime are villains in their own right. Cyborg Superman, Hank Henshaw, is a cyborg impostor who became a villain in “Reign of the Supermen” (1993), and Superboy-Prime is a Superboy who turned villain in Infinite Crisis (2005–06). Bizarro is a flawed copy, more confused than wicked. For more alternative versions, see Superman versions and Elseworlds.

Superman-inspired, not DC

Brightburn (2019) is not a DC or Superman film. It’s an original horror film, produced by James Gunn, written by Brian and Mark Gunn and directed by David Yarovesky, that asks what would happen if a Superman-like boy raised on a farm used his powers to kill. It took about $33.2 million worldwide. The same goes for The Boys’ Homelander: inspired by Superman, but not Superman.