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.
The notion of Superman assuming a Green Lantern identity on Krypton was explored in mainstream continuity. In JLA #8-9, the notorious supervillain known as the Key ensnares the Justice League in their own personal dreamscapes using a neural virus.