Inspector Spacetime/Nightmare Fuel

The show's been on for almost 50 years. That is also the amount of time the monsters from Inspector Spacetime will keep you awake at night; not for nothing is it said that kids can only watch IS from behind the sofa, with their hands over their eyes, while wearing a welding mask that blocks out 90% of all light.

General
"Ring ring, goes the bell/ One day we all must quit/ Ring ring, goes the bell/ Till the "
 * The Blorgons. They may look stupid, but they will give you nightmares.
 * Clothons. Just think about it. Waking up one night as you find your own pajamas strangling you to death, being attacked by underwear in a retail store, forced to wear clashing colours....
 * The Inspector-puppet in "Mindscrew" was rather adorable. The Final Stage puppets.. not so much.
 * The Snarling Lions. Does this even need explaining? Many a fan has found themselves unable to watch the Lion King ever again.
 * The Quiet Men and the fact that they won't shut up, especially concerning the Ironic Nursery Rhyme about.


 * As soon as you see a Quiet Man, you instantly are strucken mute, leaving you wide-eyed and helpless as it gets ready to blow you to pieces. Oh Crap.
 * The Loudness. They engulf your mind with disturbing images and sounds of their feeding on you, your friends and family. The more there are, the less you can think about anything else, until your mind simply overloads and shuts down, giving them the opportunity to feed on your comatose body.
 * The Sandmen, from "The Deserts of Venus." Humans who have been infected by a virus in the sand, turning them into shuffling zombies with sand and dirt constantly pouring off of them. The sand gets into machinery and clogs up the insides, rendering them useless. Most terrifying, however, is their method of infecting others: they bury people in the sand they constantly produce, essentially mummifying them, then the infectee bursts out of the pile of sand in typical zombie-esque fashion.
 * The Hollow Men, from the Ninth Inspector two-parter "The Cambiare Machine"/"A Spacetime Musical". Their Black Eyes of Evil are literal void. They're Action Bombs whose shrapnel turns people into more Hollow Men. And their screeches are... enormously creepy.

Specific Moments

 * The Sergeant verbally dissecting Joanna's family and the de-aged Inspector as he holds them hostage during the dinner party. Anthony Hopkins' subdued performance as the Sergeant lends some legitimate creepiness to the performance as he, one by one, brings all of the Martin family to tears without even leaving his seat. Even worse: it's implied that he did this to them every night during The Month That Was Meant To Be, while holding them hostage on his submarine.
 * The Teaser from Season 22's "The Mark of the Maharani." The Sixth Inspector relaxing in a leather armchair, staring directly into the camera, and muttering quiet, rhythmic gibberish (that, it turns out, is a synopsis of the episode's plot in backwards Latin)? That's a bit creepy. But upon repeat viewings, you pick up more details--like the fact that he doesn't blink even once during the nearly two-minute-long intro, or that there are strange amorphous things churning in the darkness behind him, or that for a few frames toward the end his eyes appear to be charcoal drawings crudely sketched onto an expanse of otherwise featureless skin, or that the Inspector is referring to you by name.
 * It's worth noting that no one at BTV actually remembers writing or filming this intro, and that until his death Graham Chapman denied the person in the chair was him.
 * At one point the pipe in the Inspector's hand is replaced with what appears to be an inhumanly large severed finger.
 * Even the armchair is unnerving, with those odd interlocking patterns stitched into it..
 * Those are faces.
 * I spent a few hours watching the intro over and over, trying to spot something I'd missed before. I woke up drenched in sweat with unexplained sores on my hands and back and dozens of index cards filled with neat block print that read "THEY YEARN TO MEET YOU."
 * Burn the cards.
 * The climax of part one of the Snarling Lions two-parter Stare Into Darkness/See No Evil, where the lights come on and the Inspector realizes that the darkened building that he has just chased the Lion into is
 * Yeah yeah, they did "The Gloom of Aquanus" when they went over-budget on sets, but the sequence with that Shadow Vector thing is still damn creepy.