A thief breaks into an archaeology museum and inadvertently reads an inscription on a tablet, letting the demon Karkull possess him. When Karkull goes on a rampage Superman intervenes but his powers are useless against the demon's mystical powers. Karkull seals people within the Daily Planet building with an impenetrable force field. Superman goes to find the sorcerer Dr. Fate. Fate, having given up the battle, tells Supes to get lost but Inza, Fate's wife, gives him a talisman that lets him get through the force field. Karkull has transformed the entire Planet staff into demons (including Lois and Jimmy). Superman is on the ropes when Fate decides to intervene and reassembles the tablet that imprisoned Karkull. When Karkull knocks it into the pit Superman goes after it while Fate draws the demons' attention. Returning with the tablet, Fate casts the spell to imprison Karkull once more.
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