Episode Description: Beware, spoilers! To read - hover over the text.
The Professor attempts to catch the monster escaped from the lab, but due to senile periodically forgets what he is doing. The crew decides to rejuvenate it and drains in the Spa. But the mistake Bender turns the rest of the crew in adolescents. The Professor tries to get it back, but only further rejuvenates them, making practically babies.