10 Shocking Times Comic Book Heroes REFUSED To Help
3. Superman Refused To Help The Xonn When His Cousin Asked For Help
In a three-issue story arc called "Krypton No More, This Planet is Mine, and Blind Hero's Bluff," Superman suffers a bit of an identity crisis. He begins attacking pollution-producing factories and works hard to remove anything that might endanger the planet's delicate ecosystems, so he won't see Earth die like Krypton.
Supergirl confronts him and explains that Krypton is a fantasy, and the two of them are human mutants. She even smashes the bottled city of Kandor to prove it to him. With this news, Superman is confused, but he also feels as if he should devote more time to protecting the Earth.
When the J'ai decide to invade the planet Xonn, Supergirl rushes to her cousin, asking for his help in protecting the peaceful planet. Instead of doing exactly that, he tells her his priorities are no longer so universal, and he has to focus more attention on his "home" planet.
She goes off to fight with Krypto, and they get clobbered. After some time, Superman checks on her and rushes to her aid. It was then that she explained that she and the Kandorians were worried about his mental health, so they cooked up the "fake Krypton" scheme to ground him.