A member of the Green Lantern Corps crash-lands on Earth and passes his ring on to Kyle Rayner—a Daily Planet artist who becomes the next Green Lantern. With Superman's help, Kyle learns the power of the ring and quickly becomes a valuable partner. They work together to battle the power-hungry, ruthless opponent Sinestro.

Creatures of the sea are acting in strange and aggressive ways lately. It turns out Lex Luthor is undergoing an unethical, underwater experiment and has also imprisoned the legendary Aquaman. Lois and Clark must help Aquaman before a war breaks out between Earth and the City of Atlantis.