The Sarah Jane Adventures/Nightmare Fuel


 * Being Lighter and Fluffier, The Sarah Jane Adventures doesn't have a lot in the way of nightmare fuel, but the  Odd Bob episode is about evil alien clowns that make children disappear. Anyone who afraid of clowns, don't watch this.
 * It's not so much the clown itself, but the fact that there's a clown museum, containing, amongst other things, an animatronic clown which laughs creepily while rocking back and forward, and... the dancing puppet which terrified Sarah Jane as a child, which may or may not have been possessed.
 * Not to mention that wherever you disappear away to, eventually you fade even from there. Recent victims can be saved: everyone else just vanishes.
 * It is implied (never stated outright but obvious to anyone who knows how the Slitheen operate) that the child Slitheen killed and skinned at least two children around the same age as the protagonists.
 * Mona crukking Lisa. Rampaging with a ray gun. Plus the Abomination. Then there's
 * At the end of The Gift, the team is Covered in Gunge -- gunge that is.
 * The Nightmare Man. Looks like a cross between the Nicholson and Ledger Jokers, has this creepy giggle, and grows more powerful off people's nightmares. Not to mention the fact that he's literal nightmare fuel.
 * Lost in Time gives us the prospect of a Nazi takeover and children locked in a burning room.