John Robinson and Don West are transported onto a strange new world where their evil opposites exist and plan to change places with them. Will, The Robot and a reluctant Dr. Smith set out to find and help the real Don and John only to be pursued by a evil John Robinson.
Smith lands the pod on a planet where plants are the highest form of intelligence next to the writer of this episode. The Robinsons lands only to be captured by Tybo a giant carrot. He plans to turn them into trees while Dr. Smith becomes a stalk of celery.