Big Twilight Zone fan here. Definitely one of the best written shows of all-time. And it is also fun to spot all the famous actors who appeared in the episodes.
The one that stands out for me is "To Serve Man", starring Richard Kiel, best known as Jaws in the James Bond movies. I’m sure most know the ending, but I’m not going to spoil it here.
Two others are "The Howling Man", where a monastary claims to have the devil locked up in a jail cell and the episode that takes place in a diner, where the Martian has three arms and the alien from Venus has three eyes.
I was very young when the show was on and it made a great impression on me. Are the reruns on anywhere?