 Thus, if they persisted in their anti-Kryptonian wanderlust, they would all die from it.One Daxamite, Mon-El, was poisoned by lead and preserved in the Phantom Zone until a cure was found by Brainiac 5 in the 30th century, whereafter Mon-El became a member of the Legion of Super-Heroes.After the 1985 miniseries "Crisis on Infinite Earths", the Silver Age version of Krypton was replaced by a newer version.