When Madame Mayhem, Geri Sloane’s evil alternate timeline twin, tries to eliminate both the JSA and the Sloanes from history, the time-master Mr. Weed knows something needs to be done about her. But he needs an agent to act on his behalf. Who better to do so than Miss Terrific? Guest starring Gary Concord, the Ultra-Man!
Can Geri Sloane, daughter of the heroic Mister Terrific, truly be mad as her actions as Madame Mayhem seem to indicate, or is there more to her tale than meets the eye? The JSA is determined to find out! But are they prepared for the time-travel manipulations of Geri’s evil double from an alternate timeline? Introducing Miss Terrific!