Green Lantern #59 (1968) - CGC 6.0 - First Appearance of Guy Gardner

Green Lantern #59, published by DC Comics in March 1968, is a key Silver Age issue best known for the first appearance of Guy Gardner, who would go on to become one of the most prominent members of the Green Lantern Corps.

Written by John Broome with art by Gil Kane, the issue introduces Guy Gardner as a backup candidate selected by the Guardians of the Universe to receive a Green Lantern ring if anything were to happen to Hal Jordan. Though he doesn’t immediately become a full-fledged Green Lantern in this issue, his introduction sets the stage for his later evolution into a tough, no-nonsense hero with a bold personality and a major role in DC's cosmic and Justice League storylines.

This issue is a key collector's item due to Gardner’s lasting popularity and importance in Green Lantern lore.