(WBNG) - Written to be the pilot episode of The Twilight Zone in 1958, and said to be cast aside by the network for being too grim, the script for “The Happy Place” sat in Rod Serling’s archive up ...

The Twilight Zone has delivered iconic episodes, and there are some that every sci-fi fan has to watch at least once.

There's no shortage of scares on the small screen, but the most disturbing horror TV shows had viewers shaken long after the credits rolled.