Season 12, Episode 18:
The Memory RemainsSam and Dean investigate disappearances in Tomahawk, Wisconsin linked to a legendary creature named "Black Bill." Meanwhile the British Men of Letters comb through the bunker for anything that can be used against the Winchesters.
Body CountFor this episode: 3 humans, 1 god
For the series so far: At least 1333 humans (of which 22 were witches), 1132 angels (2 of which were archangels), 193 demons, 78 vampires, 59 ghosts, 36 Jefferson Starships, 23 gods, 19 zombies, 19 werewolves, 11 hellhounds, 8 Bisaan, 7 shapeshifters, 7 skinwalkers, 6 changelings, 5 djinn, 6 reapers, 4 dogs, 4 ghouls, 4 Leviathan, 3 Khan Worms, 3 Thule, 2 Amazons, 2 arachnes, 2 kitsunes, 3 rugarus, 2 vetalas, 2 zannas, 1 banshee, 1 cat, 1 crocotta, Death, 1 deer, 1 dragon, 1 fairy, 1 familiar, 1 lamia, The Mother of All, 1 nachzehrer, 1 okami, 1 phoenix, 1 pishtaco, 1 Purgatory creature, 1 qarin, 1 rakshasa, 1 rawhead, 1 shojo, 1 shtriga, 1 siren, 1 soul eater, 1 Titan, 1 wendigo, the Whore of Babylon, 1 wicked witch, and 1 wraith
- The Atoner: Sheriff Bishop stops his family's tradition of making sacrifices to Moloch and generally tries to do good for his people.
- Bastard Bastard: The culprit turns out to be Sheriff Bishop's illegitimate half-brother.
- Company Town: The meatpacking plant owned by the Bishops used to effectively run the whole town.
- Dead Person Impersonation: Ketch texts orders to Sam and Dean under the guise of the recently murdered Mick Davies. When Sam and Dean call Mick's number, Ketch claims that he's flown back to London, so they report to him for now.
- Human Sacrifice: The Bishops built their fortune by sacrificing people to the god Moloch.
- Nothing Is Scarier: We never get a good look at Moloch.
- Porn Stash: Ketch searches Dean's cache of Busty Asian Beauties.
- The Resenter: Pete Garfinkle, Sheriff Bishop's half-brother, feels that he should have what the acknowledged Bishops have always had, and is willing to use Moloch to get it.
- Sinister Surveillance: Ketch plants a bug in the bunker, allowing him to listen in on the Winchesters.
- Stalker with a Crush: It appears that Ketch has developed a fixation on Mary, as he steals a picture of her from the bunker.
- The Stoner: Possibly Jarrodd, definitely Daryn, which is why the latter is never believed.