The BEST episodes directed by Frederick Pohl

#1 - The Bitterest Pill

Tales from the Darkside - Season 3 - Episode 3

A boy treated poorly by his parents gets the upper hand when an eccentric uncle shows up and tries to convince the parents to finance him to develop his newest invention - a pill that increases brain power and memory. He has a stroke and dies but not before the boy swallows the one and only prototype, and soon puts his parents into the same position he was before.