0 in stories and films, a fictional (= invented) substance that can hurt the character Superman, who is extremely strong and not hurt by most things --
Bizarro loses his hand and is thrown into a volcano and is presumably deceased, however, his hand is turned into red kryptonite at the bottom of the ocean.
One of the ingredients is kryptonite.
Although he apparently had succeeded in stopping most of the deadly radiation to reach humanity a strange fission wave reached around the world and changed all kryptonite into pure iron.
Long enough exposure to green kryptonite may eventually lead to death.
Firstly, he has a kryptonite-style weakness to mouldy bananas.
He retains his weakness to kryptonite, but rather than stripping him of his abilities, it causes him extreme pain, nausea, and confusion.
In all other respects the chemistry matches that of the rock containing kryptonite in the movie.
He finds only gigantic, asteroid-sized chunks of kryptonite, pieces of the planet that were irradiated by the supernova that destroyed the great civilization.
