There are actually 4 characters
who have been called Green Lantern... Those 4 being Alan Scott, Hal Jordan,
Guy Gardner, and John Stewart. Each Green Lantern possesses a power ring
that gives the user great control over the physical world as long as the
wielder has sufficient willpower and strength to wield it. While the ring
of the Golden Age Green Lantern (Alan Scott) was magically powered, the
rings worn by all subsequent Lanterns were technological creations of the
Guardians of the Universe, who granted such rings to worthy candidates.
These individuals made up the intergalactic police force known as the Green
Each of Earth's Green Lanterns
has been a member of either the Justice Society of America or the Justice
League of America, and John Stewart was featured as one of the main characters
in both the Justice League and the Justice League Unlimited animated series.
The Green Lanterns are often depicted as being close friends of the various
men who have been the Flash, the most notable friendships having been between
Alan Scott and Jay Garrick (the Golden Age Green Lantern and Flash), Hal
Jordan and Barry Allen (the Silver Age Green Lantern and Flash), and Kyle
Rayner and Wally West (the modern age Green Lantern and Flash),
as well as Jordan being friends with West.