The Best of Both Worlds was very chilling with the evil incarnate of the Borg and the terrifying performance of Stewart as Locutus.
Night Terrors
Identity Crisis
Schisms
Cause and Effect
Violations
Scorpion
Regeneration
I didn't find Time's Arrow creepy - probably because most of the episode was about our heroes mucking about in early 20th century San Francisco and Data getting into funny situations.
The episode itself wasn't creepy but there were a few eerie moments--the brief scene with the aliens appearing as humans with that snake cane going after the ailing older guy and then the well shot scene with the away team receiving a detailed description of what he observed in the alien realm.
VOY The Thaw was definitely creepy all the way through.
I hate The Thaw--I don't find it creepy just campy.
I admit I don't remember Night Terrors very well.
It had some nicely creepy bits, but the overall effect was undercut somewhat by ridiculous scenes featuring
Troi floating in a nebulous void and mewling "Where are you?" at a pair of white lights.
I've always found this particular criticism weak. Night Terrors is actually really underrated and one of my favorite Trek episodes.
It has it all-a creepy atmosphere, great character moments and is anchored by an intriguing mystery. The episode has a very surreal dreamy feel and it has great ominous, moody music.
The officer talking to O’Brien about the old man in the old-style Starfleet uniform seen lurching in engineering(creeeeepy); the sobering realization that the crew are finding themselves in the same exact situation as the Brattain and the the same tragic fate that befell that ship is beginning to take place on the Enterprise; the image of all the corpses sitting up inside the makeshift morgue. There’s a nice unsettling moment where a young ensign hears something on the Brattain and then Geordi, the more experienced senior officer, offering reassurance to him that his reaction is only normal given the horrific events that transpired on the ship; Crusher missing hitting her comm-badge on the first attempt because of her deteriorating condition.
The door chime repeatedly going off before Troi/Crusher knock on the door accompanied by Picard’s reaction(”What the..?”); Picard’s story of his grandfather’s senility reinforcing the strong fear for Picard the loss of his mind which is only heightened coming off the heels of his recent assimilation and nicely foreshadows AGT and the Irumodic Syndrome; Riker displaying irritability when Picard suggests he gets some rest almost like a child ordered to bed by a parent; the continuity touch of putting into use a previously attempted tactic with the deflector dish from BoBW; Riker feeling as though he wasn’t alone in his cabin; the scene with everyone’s favorite enigmatic bartender pulling out her huge phaser and taking control of the situation was classic Guinan; loved Patrick Stewart’s performance(Even when he does something that would be embarrassing to someone else he always seems to maintain his dignity; Troi gets to play a significant part in saving the day with Worf or the ship; the O’Briens have some good scenes.
Brent turned in another good showing with his android nature allowing him to be the crew’s one hope for survival. It was an interesting contrast to see Data unaffected while the rest of the crew looks awful.
I especially loved the way the writers used the fairly original idea of REM deprivation as well as the unique idea of a distress signal where aliens use dream frequencies to communicate. And the riddle of hydrogen was brilliant. The show did an extremely good job at capturing the isolation and danger of deep space. The way it was filmed and the emphasis by the crew of being out of contact made it truly feel like there were two lone ships trapped in the void of cold, deep space far from any outpost, starbase or help and at the mercy of some incomprehensible & unknown force determined to insidiously destroy them. I really liked that.