Ganthet is a fictional character in the DC Comics universe, who first appeared in 1992 in Larry Niven and John Byrne's graphic novel Green Lantern: Ganthet's Tale (ISBN 1-56389-026-7). He is also Sayd's husband.

The Guardians of the Universe are a race of extraterrestrial superhero characters appearing in American comic books published by DC Comics, commonly in association with Green Lantern. They first appeared in Green Lantern #1, and were created by John Broome and Gil Kane. The Guardians of the Universe have been adapted to a number of films, television programs, and video games.