Another really good Twilight Zone episode is To Serve Man, from 1962. Seemingly benevolent aliens come to earth, solve many of the world's problems, and take some human volunteers back to space with them in their ship. The ending is really ironic. Richard "Jaws" Kiel, who is over 7 feet tall, played the head alien. The story, originally in print, was written in 1951 by Damon Knight, a very good science-fiction writer (according to my wife, who reads a lot of sci-fi).