ISBN: | 978-5-5133-1739-5 |
High Quality Content by WIKIPEDIA articles! Kryptonite is a fictional material from the Superman mythos —the ore form of a radioactive element from Superman`s home planet of Krypton. It is famous for being the ultimate physical weakness of Superman, and the word kryptonite has since become synonymous with an Achilles` heel —the one weakness of an otherwise invulnerable hero.