"The Robot Master" - - *Superman discovers that his best friends have all been replaced by robots, creations of "The Robot Master." Together with Supergirl, he takes the mechanical imposters to the Fortress of Solitude for investigation, where he learns that the "Robot Master" is a hoax perpetrated by the Legion of Super-Heroes as part of a celebration of the anniversary of Supergirl's arrival on Earth. Inside the robots are concealed special commemorative busts of the Legionnaires. *Source: The Official Legion of Super-Heroes Index #1 - Publshed by ICG.
Also contains the back-up stories: "Superbaby Captures the Pumpkin Gang" and "The TV Trap for Superman".