Green Lantern is a superhero from the DC Comics universe, known for wielding a powerful ring that grants him the ability to create constructs and manipulate energy. The character is part of the Green Lantern Corps, an intergalactic police force that protects the universe from various threats. The most famous Green Lantern is Hal Jordan, a test pilot who becomes a member of the Corps after receiving the ring from a dying alien. With the motto "In brightest day, in blackest night," Green Lantern embodies courage and hope, fighting against villains like Sinestro and Parallax to maintain peace across the cosmos.