Lost in Space (1965)

S1E28 A Change of Space

The Intergalactic Delivery Service arrives on Priplanus, prompting Dr. Smith to look for a way to travel. He convinces Will to take the spaceship for a spin, and when Will returns, he’s noticeably more intelligent. Envious of Will's newfound smarts, Smith decides to take a ride himself. Unfortunately, his journey leads to rapid aging and a looming death. To complicate things further, the spaceship’s owner comes back to reclaim his vehicle, leaving Will and Dr. Smith stranded in their transformed conditions.