Green Lantern

A gun store owner wore a T-shirt with Green Lantern or Superman on it. (PROSE: Head of State)

Behind the scenes

 * Oa, the planet of the Guardians of the Universe in Green Lantern comics, was said to be destroyed in PROSE: The Quantum Archangel.
 * Alan Moore said in an interview that the Order of the Black Sun was "an Earth-5 version of the Green Lantern Corps".