Dr. Bragan (James Craig) is a workaholic rocket scientist with NASA who is coming unglued from the stress. A colleague arranges for him to take a much needed holiday in Japan, and Bragan accepts, hoping to use this free time to pursue his first love, botany. He brings a potted Venus Flytrap with him, with plans to study carnivorous flora and prove his theory that human beings are descended from plants. His Japanese assistant, Noroko, arranges for them to work in seclusion at her father's abandoned resort hotel, located on a mountain next to an active volcano. They get to work in the greenhouse, toiling night and day to strengthen the Venus Flytrap with the alien Nipponese soil, which causes it to grow to an unusual size. But Bragan is as obsessive and abusive as he was in America, and his constant mood swings cause Noroko to suspect that he is going mad. An experimental graft with a Japanese carnivorous plant succeeds in creating the "Sectovorus," a bizarre, vaguely human creature with vicious flytrap paws, and Bragan knows he is on the right track. Unfortunately, the beast must be fed mice, chickens, puppies and eventually human blood to keep it alive, and the stronger it grows, the more dangerous it becomes. When the Sectovorus learns to uproot itself and venture to a nearby village for victims, Dr. Bragan must decide whether to protect his work of genius, or lure it into the volcano to save mankind. Revenge of Dr. X was scripted by cult filmmaker Edward D. Wood, Jr., and is also known as The Double Garden, The Devil Garden and The Venus Flytrap.