The Eradicator , programmed to preserve all Kryptonian culture, altered the birthing matrices artificial wombs the explorers took with them so that the newborns would be fatally vulnerable to lead.
Fleischer cartoons. And he waivers. Most of the time he has no idea what he's doing.
In some cases the planet is destroyed because of its unstable sun. Several stories featured characters traveling back in time to visit Krypton before its destruction; the most well known of these is probably the 1960 story "Superman's Return to Krypton", in which Superman is swept back in time to Krypton some years before its destruction.
While Kryptonians appear identical to humans on the outside, their unique physiology gives them the potential to manifest incredible powers. Thus, Silver Age elements such as Supergirl , Krypto , and Kandor had never existed in this version though post- Crisis versions of these elements were eventually reintroduced. It's like, you don't wanna know that you're eating your vegetables.
Man of Steel. However, the planet is probably best remembered for being the setting of the opening act of 1978's Superman: The debut of the Superman comic strip in 1939 also delved into further details about Krypton, including introducing the idea that all Kryptonians possessed a minimal level of heightened physical abilities, including super-strength and super-speed.
Anderson's 2007 novel The Last Days of Krypton also provides a detailed look at Kryptonian culture, chronicling the final year leading up to the planet's destruction. New on Netflix UK: After the 1985 miniseries Crisis on Infinite Earths , this version of Krypton was soon replaced by a newer version.
DC 's mandate for Superman being Krypton's only survivor changed as well. The disaster killed millions of inhabitants of the moon, and because of this, Jax-Ur became the first criminal to be banished to the Phantom Zone , which had been discovered by Jor-El.
In some versions of the Superman mythos, additional survivors, such as Krypto , Supergirl , her parents kept alive in the "Survival Zone", a different but similar parallel "dimension" from the Phantom Zone , the criminal inhabitants of the Phantom Zone , Dev-Em , Beppo the Super-Monkey, and the residents of the city of Kandor presumably numbering in the many thousands, perhaps millions , reduced to microscopic size by Brainiac , were also introduced to the continuity.
He's just buckling down and holding onto it, and believing in whatever he can believe in, in that moment. Unfortunately, the destruction of the planet also created Kryptonite , radioactive chunks of the planet which are deadly to all Kryptonians.
And when respected scientist Jor-El found evidence that the planet was about to be completely destroyed, few of his fellow Kryptonians were willing to listen to his pleas. The New Adventures of Superman was somewhat similar to the version in Superman: By his adult years, the mysterious "Green Plague" was killing Kryptonians by the hundreds, and upon researching the matter, Jor-El discovered that the cause was growing radiation produced by Krypton's increasingly unstable core.
And so when he is finally motivated to come out of that shell, and to prove that he has to be a hero, it's a role that he doesn't really know he can fill.
However, the protective shield was destroyed in a meteor storm, exposing the inhabitants to the deadly radiation. Appropriately, even up above, it never really seems to be midday on Krypton. Other versions of the Superman origin story namely Superman: