The Mystery of the Aztec Warrior have only one clue to work with: the name of a complete stranger who can help find the answers, Roberto Hermosa. Despite the harassments, the threats, and the attacks made upon them by an unknown, sinister gang, Frank and Joe unravel clue after clue in their adventure-packed search for the living descendant of the mighty Aztec nation which once ruled Mexico. The hunt leads to a marketplace in Mexico City, to the Pyramids at Teotihuacan, to the tombs of Oaxaca-where Chet Morton, the Hardy's buddy, is nearly buried alive by foul play. It takes as much high courage as clever
The Robot vs. The Aztec Mummy in the production schedule. The evil Dr. Krupp (Luis Aceves Castañeda), a mad scientist known as "The Bat", managed to escape the snake pit into which he was thrown at the end of "The Curse of the Aztec Mummy" and continues his efforts in this film to steal a valuable Aztec treasure from the tomb of a centuries-old living mummy, Popoca (Angel di Stefani). Krupp builds a robot with a human brain in it, planning to use it to destroy the mummy, should he return to thwart his efforts. Krupp's former colleague and original finder of the mummy, Dr. Eduardo