I tried posting this on an older thread about Halloween episodes but the thread was out of commission for quite a while and I was advised to create a new one (sorry, I'm a bit OCD when it comes to creating new threads, I always look for active threads before starting something new and I didn't realize it was too old to be brought back from the dead). The older thread has some good ideas about Halloween episodes too.
Some of the episodes listed previously are good choices and there were a few I hadn't thought of previously (like the Man Trap).
But I have one for each series (except for Discovery as I have not seen it yet--waiting for the Blu-Ray).
Enterprise: "Impulse"--that one was pretty easy with the zombie like Vulcans.
Star Trek: "Catspaw"--again another easy episode, also incidentally one of the only Star Trek episodes of any series to be holiday themed on purpose
TNG: "Night Terrors" the scene where Crusher is in the 'morgue' and all the bodies sit up was classic
DS9: "Empok Nor". The combination of hostile Cardassians, the hunting of O'Brien by Garak and the dark lighting all add to a creepy feeling on the station
Voyager: "The Haunting of Deck 12" is an obvious one. This year I went down a different track though and went with "The Thaw" because of it's focus on fear, and clowns are always creepy...right
As for the movies, there weren't any really scary movies. First Contact is the best I could come up with because the Borg were always a little creepy and with the make up and filming effects in the film they managed to make the Borg in the film look even more sinister.
Some of the episodes listed previously are good choices and there were a few I hadn't thought of previously (like the Man Trap).
But I have one for each series (except for Discovery as I have not seen it yet--waiting for the Blu-Ray).
Enterprise: "Impulse"--that one was pretty easy with the zombie like Vulcans.
Star Trek: "Catspaw"--again another easy episode, also incidentally one of the only Star Trek episodes of any series to be holiday themed on purpose
TNG: "Night Terrors" the scene where Crusher is in the 'morgue' and all the bodies sit up was classic

DS9: "Empok Nor". The combination of hostile Cardassians, the hunting of O'Brien by Garak and the dark lighting all add to a creepy feeling on the station
Voyager: "The Haunting of Deck 12" is an obvious one. This year I went down a different track though and went with "The Thaw" because of it's focus on fear, and clowns are always creepy...right
As for the movies, there weren't any really scary movies. First Contact is the best I could come up with because the Borg were always a little creepy and with the make up and filming effects in the film they managed to make the Borg in the film look even more sinister.