The episode starts out at the Mystery Shack, with Dipper and Mabel watching a show called Duck-tective. Soos runs in and wants to show the twins what he found while he was cleaning, taking them to a secret door hidden behind the wallpaper. They open it and discover a forgotten wax museum. Mabel admires how lifelike the wax statues are, and Dipper states that one of them isn't as lifelike. It's actually Grunkle Stan, which scares Dipper, Mabel, and Soos and they run screaming.
Grunkle Stan then introduces the wax museum. He says it was one of their most popular mystery attractions - before he forgot all about it. He then notices that Wax Abraham Lincoln has been melted by the sun, and accuses Wax John Wilkes Booth of opening the blinds. Mabel suggests creating a new wax figure to replace it. Grunkle Stan likes Mabel's idea and he agrees to let her do it.
Mabel begins to think of ideas for her wax figure. Her first idea is a girl that is part fairy princess and part horse fairy princess. Dipper suggests she carve something from real life and Mabel draws a waffle with big arms. Dipper then suggests she draws someone in her family. Mabel then gets the idea to sculpt Grunkle Stan when he comes into the room looking for his pants. Once she is done, Grunkle Stan loves it and declares that the Wax Museum is back in business.
The next day, they have a grand re-opening of the Wax Museum. There is a mini press conference where Mabel takes questions. A reporter questions where the pizza that was promised on the flyers is. Grunkle Stan claims it was a typo, then shuts down the press conference, throwing a smoke bomb and running off with the admission money. The customers leave infuriated due to there not being any pizza. Mabel thinks it went well.
That night Grunkle Stan counts the money he made from the re-opening. He tells Dipper and Mabel to go wash up because they have a long day tomorrow. Grunkle Stan sits down to watch Duck-tective with his wax Stan figure while Dipper and Mabel are brushing their teeth. Grunkle Stan gets up to use the bathroom, but when he comes back, he finds the decapitated body of Wax Stan. Frightened, he calls over Sheriff Blubs and Deputy Durland, but they deem the case as unsolvable. Dipper believes he can solve the case and takes on the job, even though the police officers just think that it is a waste of time. He does so anyway, and he and Mabel come up with a list of suspects. Dipper says it could be months before they find their first clue. Mabel then notices a clue. She sees footprints that lead them to an ax which the belief is the murder weapon. Mabel realizes that the ax could belong to Manly Dan. They take the ax to Soos who tells them that Manly Dan hangs out at a crazy intense biker joint downtown.
Dipper and Mabel head to the biker joint called Skull Fracture and both use a fake ID to get inside. Mabel begins talking to one of the customers there while Dipper questions Manly Dan. Manly Dan has proof that proves he couldn't be the murderer and also points out that the ax is left handed while he only uses his right hand. Dipper and Mabel go through their list of suspects to see who is left handed. Once they go through several suspects, there is only one person left on the list- Toby Determined who runs the Gravity Falls Gossiper. Dipper and Mabel get Sheriff Blubs and Deputy Durland to raid Toby's office, but he also has proof that proves he is not the murderer. Dipper believes that Toby has to be guilty. Toby reveals he was in his office making out with a cardboard version of Shandra Jimenez. Dipper tells Sheriff Blubs to check the prints on the ax. He says there are none, leaving Dipper and Mabel confused and very embarrassed.
We then see Stan having a funeral for his wax figure with Dipper, Mabel and Soos in attendance (Wax figures are behind them). Stan runs out crying while reciting a eulogy. Dipper then notices that Wax Stan's shoe has a hole in it. He pieces together the clues and realizes that it was the wax figures. The wax figures come to life and threaten to kill Dipper and Mabel. Mabel asks if they are magic and Sherlock Holmes says they're cursed to come to life when the moon is waxing. He reveals how ten years ago they were an attraction in the Mystery Shack during the day, but then had the freedom to do whatever they wanted during the night until they stopped drawing a profit, leading to Stan locking them away and forgetting about them. After bringing them out of storage they tried to kill him for revenge but beheaded his wax figure by mistake. The wax figures then begin attacking Dipper and Mabel. Improvising with a fire iron, Dipper sword duels with Sherlock Holmes and purposely lures him outside to be melted by the sun.
Mabel gets rid of the rest of the wax figures by throwing them into the fireplace. Grunkle Stan walks in and thanks Dipper and Mabel for finding his wax head. Mabel says she is 99% sure she got rid of all the wax figures, but Wax Larry King's head is still in the vents.
The end credits show Mabel trying to decide which sweater to wear, the purple sequins or the yellow llama hair. She asks Dipper which sweater she should pick and, unknown to her, the wax head of Larry King peeks at her through the heating vents and suggests the one with the llama hair because llamas are "nature's greatest warriors." Mabel thinks she heard Dipper and thanks him and leaves to change while Dipper looks around in confusion.
- Written by:
- Directed by:
- Storyboards by:
- With the Voice Talents of:
- Kristen Schaal as Mabel Pines
- Jason Ritter as Dipper Pines
- Alex Hirsch as Grunkle Stan and Soos Ramirez
- Coolio as Wax Coolio
- Larry King as Wax Larry King
- John Oliver as Wax Sherlock Holmes
- Linda Cardellini as Wendy Corduroy
- John DiMaggio as Manly Dan
- Keith Ferguson as Deputy Durland
- Will Forte as Tyler Cutebiker
- Kevin Michael Richardson as Sheriff Blubs
- Gregg Turkington as Toby Determined
- Additional Voices:
- Casting by:
- Blendin Blandin, who will properly debut in "The Time Traveler's Pig," is shown picking up Dipper's shoe during the Grand Re-Opening of the wax museum.
- The camera Mabel uses to photograph the crime scene is the same kind featured heavily in the previous episode, "The Legend of the Gobblewonker."
- Stan's mourning of the loss of his wax replica is foreshadowing the reveal of the disappearance of his twin brother.
- Waffles with arms, like the one Mabel draws in this episode, reappear in Mabeland in "Weirdmageddon 2: Escape From Reality."
- Viewership: This episode was watched by 2.710 million viewers on its premiere night.
- The title of the episode is a reference to the term "headhunting," which is the practice of taking a person's head after killing them
- The featured wax figures are: Sherlock Holmes, Lizzie Borden, Groucho Marx, Queen Elizabeth II, Robin Hood, Thomas Edison, William Shakespeare, Edgar Allan Poe, Genghis Khan, Coolio, Larry King, and Richard Nixon. Also mentioned were John Wilkes Booth and a mostly melted Abraham Lincoln.
- One of the prominent wax figures is Richard Nixon. Alex Hirsch did a short animation featuring Nixon called "Imaginary Friend."
- The ax belonged to Wax Lizzie Borden. The real Lizzie Borden is infamous for allegedly murdering her parents with an ax.
- According to Toby Determined's alibi camera footage, Wax Stan's beheading took place on a Saturday.
- A man, woman, and two boys are seen at the wax museum in the wax figures' flashback, and again during the grand unveiling of Wax Stan, not having aged at all.
- The first page of the suspect list is: Manly Dan, Old Man McGucket, That Fat Guy, Angry lady, Mikey R., Uncle Phil, and Susie. The last two suspects are not shown in this episode.
- In the shot where Dipper is interviewing Manly Dan, there is a neon sign in the background which says "Hürzch." This is a reference to the creator's last name.
- In the original version of the episode, the thug Mabel talks to in the club has a tattoo on his arm that read "STAB." Due to censorship, however, in the release of this episode, it is changed to "BATS."
- Despite not appearing in this episode, Gideon's theme (as listed by Brad Breeck in his Gravity Falls Soundtrack Playlist on his soundcloud account) plays when Dipper and Mabel discover the wax figure room.
- Dipper and Mabel make fake IDs in order to get into the bar downtown. They are idenitified as "Sir Dipping Sauce," age 45, and "Lady Mabelton," age 21.
- When Dipper and Mabel leave to find Manly Dan, there is writing in the bottom right of the screen that says "G/F#103 BCT126." "G/F" likely stands for "Gravity Falls," and #103 refers to season 1, episode 3.
- Dipper mocks the Genghis Khan figure after its defeat, and he mentions that it "fell harder than the Jin Dynasty." In fact, Genghis Khan's son Ögedei Khan indeed conquered Jin dynasty at North China in 1234.
- Alex Hirsch said in the commentary that he wrote the end credits joke simply to see if Larry King would say "Llamas are nature's greatest warriors." 
- During the end credits of this episode, there is a cryptogram that reads "KH'V VWLOO LQ WKH YHQWV." Once decoded, it reads "HE'S STILL IN THE VENTS." It is referring to Wax Larry King's head.
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