Jemm is a fictional alien that has appeared in various comic book series published by DC Comics. The character exists in DC's main shared universe, known as the DC Universe. Created by Greg Potter and Gene Colan, he first appeared in Jemm, Son of Saturn #1 (September 1984). He is an analogue of DC's superhero and recurrent Justice League member the Martian Manhunter, of whom he is an occasional ally.