The Outer Limits - Season 2 - Eps 13: From Within
A mentally challenged boy named Howie is the last unaffected person in a small town overrun by a strange madness. Miners unearth ancient parasites, in the shape of worms, that attack the brains of their hosts. While the infected townsfolk lose all their inhibitions, Howie must save his sister Sheila, the only person who truly cares for him. Deprived of Sheila's guidance for the first time in his life, Howie struggles to evade his maddened neighbors and destroy the parasites. In the process, he becomes a hero to the whole town.
About The Outer Limits

Title: The Outer Limits
First Air Date: 1995-03-26
Last Air Date: 2002-01-18
Status: Ended
Rating: 7.7/10 (from 212 votes)
Language: EN
Seasons: 8
Total Episodes: 153
Network: Showtime Syfy
Genres: Drama, Sci-Fi & Fantasy
Production Companies: Alliance Atlantis, Atlantis Films, Showtime Networks, Trilogy Entertainment Group
Synopsis
Anthology series of composed of distinct story episodes, sometimes with a plot twist at the end, with occasional recurring story elements that were often tied together during season-finale clip shows.
Cast

Kevin Conway
The Control Voice (voice) (uncredited)