University of North Carolina
Univ of North Carollina: The Twilight Zone (Rod Serling)
This site discusses several aspects of the show, The Twilight Zone, and its creator, Rod Serling. Sections include Rod Serling Career, Concept, and Production, as well as details of the show like Backdrop, Plot, and Audience.
Other
Nildram: Plots of Twilight Zone Episodes
Season Three of the twilight zone, thirty-seven episodes at this site--with a summary of each.