Hal Jordan, known as Green Lantern, is a superhero appearing in comic books published by DC Comics. The character was created in 1959 by writer John Broome and artist Gil Kane. Hal Jordan is a science fiction reinvention of a pre-existing character called Green Lantern that had appeared in 1940s comic books (Alan Scott).
Hal Jordan is a member of an intergalactic police force called the Green Lantern Corps that was created by beings called “The Guardians” which were present at the birth of the universe. The are hundreds of corps members, spanning the universe and all having dedicated sectors to patrol.
Hal was the first human being to be inducted into the corps but he wouldn’t be the last. As of right now, there are four humans currently in the corps.
Hal wields a power ring which is considered to be the most powerful weapon in the universe. It can create anything the bearer could imagine. The only limitations the ring has falls on the imagination and willpower of the bearer.
The Green Lantern Corps Oath is as stated…
“In brightest day, in blackest night,
No evil shall escape my sight.
Let those who worship evil’s might
Beware my power–Green Lantern’s light!”