An archaeological expedition led by Dr. Abby Sinian in search of the Lost Pyramid of Katchu Pitchu instead encounters the Pastmaster, who unearths the pyramid by himself using the equally long-lost Jeweled Headdress of Katchu Pitchu in order to reanimate the dead monarch's army of giant mummy warriors. He sends them to destroy Megakat City and kill Mayor Manx, but when one of them knocks off Callie Briggs' glasses, he notices her resemblance to to his beloved Queen Callista. He soon abducts her and tries to force her to marry him, and only the Swat Kats can stop him, aided by a friendly robot named Cybertron given to them by Professor Hackle.