The Guardians of the Universe have divided the Universe into 3,600 Space Sectors, each one protected by one powerful Green Lantern(Ryan Reynolds), selected among fearless beings and supplied by a ring fed by the willpower from the planet Oa. When the evil force Parallax that is fed by fear destroys several Green Lanterns, Abin Sur(Temuera Morrison) flees in his spacecraft but crashes on Earth. Mortally wounded, his green ring seeks out a successor for him and finds the reckless but efficient test pilot Hal Jordan(Ryan Reynolds). Hal Jordan learns about the Green Lanterns and is bestowed with the powers of the ring. Meanwhile, scientist Hector Hammond(Peter Sarsgaard) is summoned to conduct an autopsy of Abin Sur and is possessed by Parallax. Hal Jordan is insecure about his fears and uses his powers for the first time in a party to save the life of people from a Ferris Aircraft helicopter damaged by Hector and later he discloses his identity to his former colleague Carol Ferris(Blake Lively), who is the beautiful daughter of Carl Ferris and his love. When Parallax threatens Earth, the Green Lantern Hal Jordan is the last hope to defend his planet from destruction.