Mon-El
Mon-EL
Real name: Lar Gand.
Mon-El first arrived on Earth suffering from amnesia during Superboy's time in Smallville. Mistakenly believing he was from Krypton, Mon-El was "Superboy's Big Brother" (SB No.89, Feb. 1961).
However, with his memory restored, they learned he was actually a native of the planet Daxam, a Krypton-like world, which gave Mon-El super powers under a yellow sun. Daxamite's one weakness is lead which is in abundance on Earth. Unlike exposure to Krytonite in Superboy's case, lead exposure to a Daxamite was fatal. To save his friend's life, Superboy projected Mon-El into the Phantom Zone.
Mon-El remained trapped in that twilight dimension for over a thousand years until Brainiac 5 of the Legion of Super-Heroes concocted an antidote for Mon-El's lead poisioning.
Fully cured Mon-El became a member of that heroic teen brigade of the future, the Legion of Super Heroes.
When Superman visited the Adult Legion of Super Heroes, he learned that Mon-El was roaming the spaceways as an explorer, clearing the way for intergalactic settlers.
External Links to Online Comics
" Superboy's Big Brother" from Superboy 89 [1]