"Expanding Human" is an episode of the original The Outer Limits television show, first broadcast on 10 October 1964, during the second season.
Professor Peter Wayne is disturbed to hear that his university colleague, Dr. Roy Clinton, is pursuing forbidden drug experiments with a group of graduate students.
When one of the students turns up dead, Professor Wayne investigates Clinton's activities.
Some success, some failure, but either way the gnawing hunger to know is never sated, and the road to the unknown continues to be dark and strange.
(Homeier, Doohan, Andes, Wingreen and Duryea all appeared in Star Trek: The Original Series)