A brilliant scientist learns to reduce humans to Lilliputian size and finds the perfect guinea pigs when three colleagues try to discover his secret. Dr. Bulfinch, Bill Stockton, beautiful Mary Phillips, and the Mexican, Pedro, did not remember what had happened after the furious scientist caught them snooping in his secret room. Now they did not know where they were. They rose, shakily, breathing in great gasps. Everything was dark. "Where are we?" Mary cried out. Suddenly horror grew in Pedro's eyes as he remembered something. He gasped, "He made my Pinto, the mule, little. Now I know... He has made us little like my mule..."