Clark, Bruce and Dick are sent into the past by Dr. Nichols to discover the identity of the Man in the Iron Mask.
- Cover by Win Mortimer.
- "Three Super-Musketeers!" (Superman, Batman and Robin) written by Edmond Hamilton, penciled by Dick Sprang and inked by Stan Kaye.
- "The Indian Fortune Teller!" (Tomahawk)
- "Get Your Ticket to the Treasury of Books" (public service message by Superman and Batman) written by Jack Schiff.
- "Adventure Under the Sea" full text article by Jack Miller.
- "The Pictures of Peril!" (Green Arrow) written by Dave Wood.
- "Little Pete" gag strip by Henry Boltinoff.
Batman: We've got to stop them from finding out who the Man in the Iron Mask is!