A meteorite made the frozen ultimate being land back on Earth a century after he was defeated.

From Jojo's Bizarre Adventure (No need to know of the series)

Kars is the leader of the Pillar Men, and the designer of the Stone Mask. His goal was to evolve further to become immune to the sun's rays through the Red Stone of Aja to empower his Masks, battling the Ripple users for its possession. Though succeeded, his body was thrown out of Earth's orbit and onto space, making him end as a frozen organic and mineral being that stopped thinking. After a meteorite changes his course and makes him land back on Earth a century later, he is severely weakened, tired from the horrible event, and capable of dying if he tries hard enough.

Tbh, I don't think you need to KNOW of JJBA to use Kars. I literally treat him like I know nothing of him or his story and he just explains who he is and makes for a realistic reaction to an odd man appearing in your backyard.