DC · February, 1968
1st Appearance of Q-energy; 1st appearance of Q-energyl Includes reprint from Action Comics #222; 1st Appearance of Q-energyl Includes reprint from Action Comics #222
The Case of the Lethal Letters!; The Duplicate Superman!; The Legendary Lore of the L.L.’s (text); The Fortress of Fear!
Writers: Cary Bates, Otto Binder
Artists: Ross Andru, Al Plastino