Green Lantern (1960 2nd Series DC) #184
Cover art by Gil Kane. This issue has only three new pages and reprints Green Lantern #59, which was the first appearance of Guy Gardner.
"Earth's Other Green Lantern!", script by John Broome, pencils by Gil Kane and Dick Giordano (additions), inks by Sid Greene and Dick Giordano (additions)
The Guardians show Hal Jordan what would have happened if Guy Gardner had been chosen by Abin Sur as his successor. In that alternate past, Guy travels to the planet Ghera, which Hal never had, and ends a civil war there.