Superman: Last Son of Earth

Superman: Last Son of Earth is a DC Comics Elseworlds tale released in the year 2000. It was written by Steve Gerber with art by Doug Wheatley. There was a sequel in 2003 called Superman: Last Stand on Krypton.

The story is a reverse of the usual Superman origin with him being sent from Earth to Krypton and discovering a Green Lantern power ring, which he uses to become a superhero. Gerber's focus is more on social commentary: particularly xenophobia, cultural stagnation, and authoritarianism.

Plot
Jonathan Kent is a scientific genius who discovers that a meteor is about to crash into Earth. He then builds a rocket to carry his wife and son into space, but his wife would rather stay by his side, and so their son is sent alone. The ship eventually lands on Krypton and the boy, Clark Kent, is adopted by Jor-El. Clark eventually finds a Green Lantern ring and saves Krypton. He later uses the ring to recover his memories and he returns to Earth where he meets his love Lois Lane and his greatest rival Lex Luthor. Due to Clark's body having adapted to the stronger gravity of Krypton, Clark is a physical powerhouse when he returns to Earth (with superhuman strength, speed, agility, endurance, and resistance to injury, much like the classic Superman in his earliest appearances), which he discovers when Luthor steals his ring in an attempt to access its power.

In other media

 * The premise of Superman becoming a Green Lantern on Krypton was visited in mainstream continuity. In JLA #8-9, the supervillain known as the Key traps the Justice League in their own private dreamworlds using a neural virus. In Superman's mind, he was born and raised on a Krypton that had not exploded. One day he discovered the dying Green Lantern Tomar-Re crashed on Krypton. Tomar gave Superman his power ring and named him the Green Lantern of Sector 2813. In this fake reality Superman was able to use his ring to trap criminals in the Phantom Zone.