Martian Manhunter, J'onn J'onzz, is transported to Earth after his home planet Mars is destroyed by a psychic plague. Adopting the human identity of Detective John Jones, J'onn uncovers a conspiracy involving ancient artifacts and a malevolent entity, Fernus, who created the plague. J'onn's investigation leads him to discover hidden Martian survivors, including his resentful brother Ma'alefa'ak.
