Skid and Pump go out to celebrate Spooky Month despite it being June, and decide to drop by the mall to get a Happy Fella doll. Meanwhile, Lila calls an exterminator to deal with Moloch, whose furious fits in the attic she's mistaken for a rat skittering around.
"Unwanted Guest" contains examples of:
- Anguished Outburst: After Skid and Pump innocently ask the Hatzgang if they'd like to meet The Eyes of the Universe again, Roy launches into a rant, yelling at the two for getting him into trouble with his parents. Ross attempts to calm him down, and Roy snaps at him instead, tearing up.Ross: Dude, it's okay—
Roy: IT'S NOT OKAY! - A Day in the Limelight: This episode prominently features Moloch, a minor character from the previous shorts who gets upgraded to the role of main antagonist here.
- The Dead Can Dance: The corpses inside the hospital morgue suddenly rise back to "life" and perform a Michael Jackson's Thriller Parody, throwing in the Spooky Dance for good measure after Skid and Pump say it's Spooky Month. After a fit of terror, Patty tells the bodies that it's actually June, not Spooky Month, causing them all to immediately drop dead again.
- Demonic Possession: While Dexter is setting up his rat trap in the attic, Moloch ambushes him, seizing control of Dexter's body in order to finally escape and exact his revenge on Skid and Pump.
- Did I Just Say That Out Loud?: When the two cops walk into the Candy Club after Skid and Pump leave, Kevin overhears the tail end of their conversation where John reassures Jack over accidentally shooting someone. Kevin snarks at how "surprising" it is for a cop to shoot someone, at which the two glare at him. Kevin then realizes he said it out loud.John: It's fine, Jack. It wasn't your intention to shoot him!
Kevin: Wow, a cop shooting someone. What a surprise.
(Both cops give him a Death Glare)
Kevin: (thinking) OH NO! I SAID IT OUT LOUD! - Exorcist Head: Invoked and subverted for laughs. While trying to convince Skid that the possessed, currently floating Dexter is indeed Moloch, Pump tells him to turn his head backwards, as it's something only demons can do. Moloch begrudgingly obliges... but breaks Dexter's neck while trying, instantly killing them both.
- Fingertip Drug Analysis: After Skid and Pump leave a suspicious package for Kevin at the Candy Club, Sheriff John and Deputy Jack suspect that the clerk is trafficking what looks like cocaine. John opens the package up and tastes a bit of it with his finger, surprised that it is actually sugar as Kevin claimed.
- Foreshadowing: While walking out of the mall, Pump remarks that they should burn the Happy Fella doll they just bought to see if it screams. This ends up coming to pass in "Deadly Smiles", where they force the doll into the oven and Lila sets it to burn, the doll screaming as it melts from the heat.
- Forced to Watch: At the climax, Lila is rendered helpless as the demon Moloch threatens to kill her son and his best friend right in front of her. Fortunately, Pump (unwittingly or otherwise) dupes said demon into accidentally defeating himself by snapping his own neck.
- Fun T-Shirt: During the episode's opening montage, Lila is shown wearing a t-shirt that says "look at me in the eyes", with the eyes printed where her breasts are.
- Poor Communication Kills: At the beginning when Moloch is making noises in the attic, Lila assumes that it's caused by a rat scurrying around. Skid tells her that it's his "friend" Moloch, so Lila thinks that he's playing with a rodent and gave it a name. Skid doesn't even bother correcting her that Moloch is actually a demonic monster from the fiery depths of Hell; a problem which would require hiring an exorcist instead of an exterminator...
- Prison Rape: Due to believing that the pack of sugar Skid and Pump gave him is a narcotic drug, Kevin internally panics when the cops come by, thinking he's going to get arrested and suffer through having "[his] fudge packed in jail". Luckily for Kevin, it was actually sugar, so the cops leave him be.
- Reduced to Ratburgers: When he rants at Skid and Pump in the climax, Moloch mentions that he was forced to eat rats and spiders for the past two years in the attic, offscreen. Humorously, this makes Lila's decision to hire Dexter the exterminator to kill rats in the attic ironic in hindsight, because Moloch was already handling pest control for the house this whole time.
- The Stinger: The YouTube version gives us the return of Ooga Booga after she had been seen wearing a full-body cast in the hospital earlier in the episode. The Newgrounds version shows John and Jack interrupting a cult meeting in the spooky house that's seemingly led by Mr. Clown, with Jack shooting the Clown to death in a panic.
- That Was Not a Dream: Roy passed off the Hatzgang's encounter with the Eyes of the Universe in "The Stars" as a dream, and starts to pick on Skid and Pump as usual in "Unwanted Guest". It's only when the cowering Ross and Robert mention the "big scary monster" that Roy realizes that it did actually happen; he shifts to being just as scared as they are, before snapping at Skid and Pump.
