- An Alien Episode, whether as a parody of classic Alien Abduction and/or Alien Invasion plots, or of the space creatures from movies like Alien and Predator.
- Demonic Possession yet again; only this time, it's a full-on parody of The Exorcist. Maybe Robert's little sister, who was very ill in "Tender Treats", turns out to be suffering from an infernal infection; so she plays the role of a Reagan expy, with Father Gregor serving as the exorcist. And to make things a little more fresh, the demon responsible turns out to not be Moloch this time around, though maybe they personally know each other.
- Confirmed! "Hollow Sorrows" is a parody of The Exorcist that heavily features Father Gregor and Moloch.
- An Evil Sorcerer or Wicked Witch, who may be an ally or member of the cult, causing trouble by using a Black Magic curse. Apparently, the third episode "Unwanted Guest" was originally going to involve a witch, until that idea was scrapped in favor of Moloch as the antagonist; but maybe Sr. Pelo will rework this witch plot for a future episode?
- Ghosts. For example, a Haunted House would provide an obvious setting for the boys' Spooky Month shenanigans.
- Maybe the graveyard seen before in the series could be haunted, and something happens which awakens the local spirits (like the construction of a building), leading to a parody of Poltergeist (1982).
- As Sr. Pelo is Mexican, perhaps he may feature a famous ghost story from his own country, like La Llorona. Obviously, she would try to take Skid and Pump away with her, presumably to drown them in a nearby lake or river. And being as oblivious as ever, the boys think she's just some harmless lady in a white dress.
- A Vampire Episode of some sort, maybe with Dracula himself in it. As a bonus, Streber (let's assume that he survived Bob's murder attempt) either gets bitten by one of these bloodsuckers or (if he did die) get resurrected somehow, turning him into a real vampire (though hopefully he remains friendly).
- Partly jossed : Streber is shown to be alive in "Hollow Sorrows", but a vampire-focused episode is still possible.
- Werewolves or other werebeasts. A possibility could be that Skid and Pump find the werebeast in question and, depending on the animal, think it's capable of being a pet and try to take it in.
- Maybe... Kevin is not what he seems? (more on another WMG)
- Given the subtle implications that the show is set in Arizona, maybe a Navajo skinwalker could appear to make use of a spooky monster from local folklore.
- Speaking of monsters from Native American myths, how about a wendigo? Maybe Bob Velseb somehow gets resurrected and transformed into one, given his cannibalistic tendencies.
- Zombies in an Episode of the Dead. While zombies have already appeared for a couple brief gags in the first and third episodes, they haven't yet been utilized in a more substantially plot-relevant way.
- Maybe Skid's grandma will eventually return to check on her family? She was already an undead corpse in her first and thus far only appearance, so it would be no shock if she suddenly rose from her grave, whether as a zombie or a ghost (if her body is too decayed to move around in).
- Or maybe some parody of Frankenstein's Monster and/or a mummy will appear for the sake of a classic Monster Mash.
- Yōkai. We have already seen many background cameos of Touhou Project characters, so a yokai-themed episode could go all-out on the references. Maybe one of the cameos is a foreign visitor from Japan who accidentally brings with them a bunch of yokai that cause chaos all around town.
- Speaking of monsters from Japanese media, how about Kaiju? The movie that popularized the genre was a disaster horror film, so they're still a good contender for horror parodies. Also, Rule of Cool.
- Assuming that there will eventually be another Halloween Episode like "Tender Treats", then maybe there'll be some use of the Becoming the Costume trope. It's not a very original idea, but it's still worth a few visual gags involving Skid being turned into a walking skeleton, Pump getting an actual pumpkin head, or other characters having transformations that are Played for Laughs.
- Speaking of Halloween and other holidays, it only seems natural that a future video should be a Christmas Episode; complete with Santa Claus showing up, and maybe with The Krampus as an antagonist. Perhaps with a few allusions to The Nightmare Before Christmas, or a Christmas horror movie like Krampus.
- A parody of A Nightmare on Elm Street. Spooky Month has already parodied Child's Play and Halloween with "Deadly Smiles" and "Tender Treats" respectively, so Nightmare is simply the next logical step for a Slasher Movie spoof (given how Friday the 13th would likely be just a bit too similar to the plot beats from "Tender Treats"). Besides, having the villain be a dream killer like Freddy Kreuger has so many creative options for how the episode could go. Also, with the below prediction that Skid's dad and Pump's parents will appear by Episode 6, this potential parody could tie into it as well, with them appearing in one of the dream sequences.
- Partly jossed: in episode 6 "Hollow Sorrows" neither Skid's father nor Pump's parents make a physical appearance.
- A parody of The Shining, as it would be another obvious choice for classic horror movie parodies. It could be a great way to move the setting away from the town the show takes place in, and maybe it could even be a sort of prequel, with Skid's father taking the role of Jack Torrance and the episode showing what exactly happened to him.
- A parody of The Autopsy of Jane Doe, because it's noted in the Spooky Month ARG that Dexter's body can turn rock hard and his blood combusts when exposed to oxygen, it would definitely warrant some investigation about that.
- A Jekyll & Hyde archetype as a future antagonist.
- Either a straight example of Dark Is Not Evil, or Black-and-Gray Morality when it comes to a monster conflict.
- An episode focused on the Ooga Booga, either as the main antagonist or as a Wild Card jumpscaring everyone else (except the unfazed duo).
- Jossed. The effects their absences have on their children's lives are touched upon in "Hollow Sorrows", but none of them make a physical appearance.
- Jossed. Radford gets a little more development, but the Hatzgang serve an incredibly minor role, and aside from Jaune and Ross' dad, the rest of their families are not present.
- Zigzagged. Roy has not quit his bullying (and even beats them up when Skid and Pump apologize to him), but Ross and Robert actually try to protect them from Roy.
- Those Angry Animalistic Growls he made in both "Deadly Smiles", "Tender Treats", and "Hollow Sorrows" sounded very canine, and at the last word of his line "That doll I threw in the back is YOURS?!", you can hear a faint snarl/roar.
- As he scolds Skid and Pump, you can see his teeth grow sharper, a rarity in the human characters not counting Streber (for obvious reasons).
- He was absent in the first episode, and while it can easily be explained with that he wasn't thought of yet, it should be noted it's the only episode with the full moon visible, so there's a perfect In-Universe explanation if we're to assume werewolves in Spooky Month are the full moon-transformation type.note
- Even when scolding Skid and Pump for all their actions, Kevin practically instinctively protects the two from Bob in "Tender Treats": could be basic decency... but wolves are known to be loyal to their pack, especially these days; adding that "Hollow Sorrows" he worries about seeing Skid and Pump together with Father Gregor, mistakenly suspecting him to be a pedophile.
- Ultimately, while this "evidence" is not really meant to be taken seriously, it could still be used as subtle foreshadowing just for fun.
The theory seems even more solidified in the episode "Hollow Sorrows":
- After seeing Father Gregor pass by with Skid and Pump, Ignacio calls doctor Mort at the hospital, who seems to take the situation very seriously. If we remain on this point of view, it is likely that it was Mort who alerted the cultists and organized Father Gregor's kidnapping.
- In the ARG is revealed that, after the events of the episode, the corpse of the man Patty was analyzing (presumably that of Bob Vesleb) has disappeared. It's possible that the cult has stolen it for hiding proofs.
- In a background photo in his house, Ignacio can be seen holding a plate with a cake along another man (probably Skid's dad due the clothing), with a burning fuse instead of a candle.
- Below the photo, on the table, it can see family photos of John and his daughter partially burned, with a gun and matchbox next to them.
- It is possible to glimpse the cult's necklace under his sweater.
- Lastly, it must be taken into account that Ignacio threatened Skid and Pump by saying that, once dead, he would cremate their bodies personally.
Additionally, in "Hollow Sorrows" he has an unknown chat with Father Gregor, who gets captured by the cult at the end of the episode, and had ordered the hospital to move a body Patty was responsible for. Given that Mort was unaware of Moloch's presence and threat, it is likely the Mayor ordered Bob's body to be moved given his established connection with the cult.
It would also bring a whole new level of Fridge Horror, because assuming that one or both of Roy's parents are part of the cult, then they weren't just ignorant of the implied sexual abuse that Roy received from his uncle, they may have also been fully willing accomplices in that abuse, looking the other way and feigning ignorance to it. If any of this theory turns out to be true, then this will put Roy in a more sympathetic spotlight for an episode's subplot, as he comes to terms with just how messed up his family is.
- A possible clue are the accessories that recall the medallions of the cult: it has been seen that Carmen wears a gold necklace with a gem set in the center which turns cyan at some point (just as Skid's father is often depicted with a gold ring with a teal gem).
- It should be noted that the kid he burned was seen getting kidnapped by Frank, so if the kid wasn't fully human then it would explain how he survived.
- Frank doesn't kill the kids he kidnaps, he sells them back to their parents for ransom. Also more likely than not, the kid was burned by the water Gregor threw at him because it was boiling hot, not because he actually had any demonic evil in him.
- While the reason for thinking so doesn't seem to hold, confirmed for Gregor being the Big Good. He's the deuteragonist of "Hollow Sorrows" who spends the episode rehabilitating Skid and Pump, before fighting Moloch and stopping his rampage on the town. That said, it's unlikely he'll stay as a Big Good past "Hollow Sorrows" now that he was made a sacrifice to Eyes of the Universe.
- Eh, "Deadly Smiles" already prominently featured Dexter, so if he somehow showed up again, it would most likely just be for a quick cameo appearance. Alternatively...
- Jossed. Dexter's mother is a side character in "Hollow Sorrows", but Dexter only appears in one scene briefly resurrected by Moloch.
- Confirmed!