| No.overall | No. inseason | Title | Directed by | Written by | Original release date |
| 1 | 1 | "Say Cheese and Die!" | Rob Letterman | Rob Letterman & Nicholas Stoller | October 13, 2023 (2023-10-13) |
| In 1993, high school loner Harold Biddle dies in a house fire. Thirty years later, Mr. Bratt inherits the Biddle House and becomes the new high school English teacher. Star high school quarterback Isaiah and his girlfriend Allison use the Biddle House for their Halloween party. Isaiah finds a Polaroid camera in the basement where Harold died and takes a photo of Allison and Margot, his neighbor and childhood friend. When he saves Margot from an allergic reaction he saw her having on her photo, he realizes the camera depicts future bad things that will happen to the people in its photos. His photo shows him with a badly broken arm; sure enough, Isaiah breaks his arm at the game after hallucinating that the football field is full of burning monsters. Nora, the mother of Lucas, a reckless student, sees the monsters and warns Isaiah's father that Biddle has returned to punish their kids for what they, the parents, did to him. At home, Bratt is possessed by Harold's spirit. |
| 2 | 2 | "The Haunted Mask" | Erin O'Malley | Franklin Jin Rho | October 13, 2023 (2023-10-13) |
| Ignored at school, student Isabella vents her frustrations by online trolling. At Allison's Halloween party at the Biddle House, she finds an unusual mask in the basement. Upon wearing it, she becomes more extroverted and confident. As time passes, the mask influences her to lash out at people, especially after Lucas destroys her $3,000 drone. Nora passes on a photo of Harold Biddle to Isaiah, who recognizes him from the hallucination at the football game. When Isabella is punished by her mother for the drone, she wears the mask and attacks Lucas, transforming into an actual troll. When she almost attacks her little brother, she stops herself, and they discard the mask while the possessed Bratt watches. Isabella accompanies her mother to the house of James, Isaiah's best friend, where Nora has gathered the other parents to discuss her belief that Harold is haunting them. As they angrily rebuff her, Isabella knocks a ball at James while playing pool, and he explodes into yellow goo, horrifying her. |
| 3 | 3 | "The Cuckoo Clock of Doom" | Erin O'Malley | James Eagan | October 13, 2023 (2023-10-13) |
| The truth about James is revealed: at the Halloween party, he accidentally hit his head on a cuckoo clock and became stuck in a time loop, unable to leave the house. When he is finally able to turn off the clock and stop the time loop, he learns that every one of his previous attempts to leave the house created a duplicate. The "Dupes" trap him in his family's mines, impersonate him, and begin ruining his life until Isabella realizes what's happened after a Dupe explodes in front of her. She, Isaiah, and Margot work together to find the real James and destroy the Dupes. The group realizes that everything that's happened to them began at the Biddle house. Nora implies that Margot's mother, Sarah, has the answers. On a call, Sarah, who is in Seattle, tells Margot not to trust the other parents. A surviving Dupe retrieves a suitcase for Bratt, but upon finding it empty, Bratt destroys the Dupe, angrily asking where his "friend" is. |
| 4 | 4 | "Go Eat Worms" | Steve Boyum | Courtney Perdue & Baindu Saidu | October 13, 2023 (2023-10-13) |
| Lucas' father died attempting a dangerous mountain stunt. Lucas tries to honor his father's legacy by doing the stunt but is afraid. He witnesses his mother, Nora, and Margot's father, Colin, kissing and gently informs Margot of their parents' affair. To cheer her up, he shows her the tank of worms he took from the Biddle House during the Halloween party. That night, the worms slither their way into Lucas' body. He realizes he can no longer feel pain and decides to attempt his father's stunt again. Margot realizes Biddle is involved, and she and Nora stop Lucas. Nora reveals that his father was suicidal and did the stunt on purpose to die. Lucas throws up the worms, which conjoin into a monster. The trio lures it into a wood chipper and kills it. Nora lands in a psychiatric ward after telling the police about the monster. Bratt takes the eyeball trinket Lucas had dropped at the sawmill and promises that Slappy will be put back together. |
| 5 | 5 | "Reader Beware" | Steve Boyum | Mariko Tamaki | October 13, 2023 (2023-10-13) |
| Margot's mother, Sarah, comes home after months of a trial separation with Colin. She learns that Nora is sedated under the supervision of Victoria, Isabella's mother, as Victoria is afraid Nora might reveal their involvement in the Biddle incident. However, Sarah believes Nora. Isaiah and Allison break up. Isaiah might have feelings for Margot. However, Margot and Lucas have bonded and kiss. Mr. Bratt/Harold gives his old scrapbook to Margot. Upon reading it, she sees visions of Harold's high school life and learns that he and her mother were friends. Harold's ghost takes Margot to the night of the fire, where the friends learn that all of their parents inadvertently caused Harold's death after trying to steal a suitcase from his house. Bratt/Harold invites them into his home, saying he will reveal what is inside the suitcase. |
| 6 | 6 | "Night of the Living Dummy" | Félix Enríquez Alcalá | Nick Mueller | October 20, 2023 (2023-10-20) |
| In 1925, Harold's great-grandfather Ephraim bought Slappy the Dummy, an evil puppet, to revitalize his career as a magician. Slappy had Ephraim retrieve the coffin of a man named Kanduu to read a spell. After a violent vision of people dying, Ephraim rejected Slappy and hid him in his basement. In 1993, Ephraim's descendants, the Biddle couple and their son Harold, inherit his house. Harold has a hard time fitting in and discovers Slappy, who isolates him from his crush, Sarah, and has him turn his parents into puppets. After Slappy and Harold humiliate Sarah and her friends, they realize Harold changed after he found Slappy. The group breaks into his home to take Slappy away and begs Harold to come out after he locks himself in the basement, revealing that they tried to help him. Harold believed the group was bullying him, leading to his death in an accidental fire. The friends hide Slappy's remains. In the present, the children rationalize that their parents were not at fault and Harold needed help, upsetting "Bratt," who believes the parents murdered him. Bratt sheds his appearance and reveals himself as Harold to the horrified friends. |
| 7 | 7 | "Give Yourself Goosebumps" | Félix Enríquez Alcalá | Hilary Winston | October 27, 2023 (2023-10-27) |
| The group realizes they have been trapped in the scrapbook along with the real Mr. Bratt because Harold drew them in. Nora is released from the hospital and confronted by Harold. She flees and recovers the dummy's parts, intending to take them to her mountain cabin. She is tailed by Harold. Ben and Eliza investigate her family's mine to find that Slappy's remains really are missing. They are attacked by one of James' Dupes and realize that Nora was right about Harold. In the purgatory Biddle house, the group finds another one of Harold's memories. Mr. Bratt discovers that being hit temporarily brings him back to his body in the real world. The friends try to have him return long enough for him to write them a way out of the scrapbook, but Bratt struggles with Harold for control. Harold throws the scrapbook into a puddle. As the drawings are watered down, so is the world inside the scrapbook, and the group promptly falls through the melted floor. |
| 8 | 8 | "You Can't Scare Me" | David Grossman | Nick Adams | November 3, 2023 (2023-11-03) |
| The friends fall through the pages as the scrapbook disintegrates. They meet Harold's parents' spirits, waiting for Harold so the family can move on together. Bratt manages to draw the group a way out. They escape and rush to find Nora. Harold takes back control of Bratt, knocks out Nora on the mountain, and retrieves Slappy. The children are joined by all of their parents, who are themselves looking for Nora. Lucas and Margot find Nora uninjured, but Isaiah slips off a cliff edge, hanging on for life. Just as Harold is about to kill him, everyone arrives and pleads with him, apologizing. Slappy tries to hold his influence but Margot breaks through to Harold by telling him that his parents are waiting and they forgive him. Harold rescues Isaiah before throwing Slappy down the cliff. His spirit leaves Bratt's body and he joins his parents in the afterlife, at peace. As everyone believes it's over, Slappy, in pieces at the bottom of the cliff, opens his eyes. |
| 9 | 9 | "Night of the Living Dummy: Part 2" | Erin O'Malley | Mariko Tamaki | November 10, 2023 (2023-11-10) |
| Months later, everyone is trying to move on from Harold Biddle's haunting. Margot's mother invites her to move to Seattle so the children go for a weekend trip to discover the city. Lucas finds it more difficult than the others to move on from their ordeal. He breaks up with Margot, envisioning that their life goals are different, and returns home. Bratt writes a book inspired by the ordeal, his dream being to become a published author. When a New York publisher is interested but wants him to change the ending to expand on Slappy, Bratt struggles with writer's block and his burdening financial problems. He retrieves Slappy's remains for inspiration. Slappy leads him to retrieve Kanduu's coffin buried near the Biddle House, promising him an ending. Bratt reads the spell inside, which frees Kanduu's spirit from the Slappy dummy and revives his human body, revealing him to be a magician. Ben arrives and Kanduu turns him into a puppet. |
| 10 | 10 | "Welcome to Horrorland" | David Grossman | Rob Letterman & Nicholas Stoller | November 17, 2023 (2023-11-17) |
| A flashback reveals how Kanduu, who was once human, found a cave with mysterious carvings which made him immortal. A few years later, he meets Mahar, a struggling puppet maker in a failed circus, and makes a deal with him. Another year later, he delivers human puppets to Mahar and in return wants a perfect dummy. Mahar instead traps him in the dummy. In the present day, Kanduu captures the residents of Port Lawrence, including Lucas, and turns them into puppets. Returning from Seattle, Isaiah admits his feelings to Margot. Kanduu then captures the group. Kanduu explains to the teens that he plans to sacrifice 1,000 people in a "special place", which will unleash monsters. Kanduu claims this will force humanity to stop wars among themselves. The group fights with Kanduu using magic. Margot finds the spell that saved Kanduu and reverses it, making him human again. The souls of his past victims rise up to drag him to hell, but not before he shoots at Margot. Isaiah jumps to save her but is shot instead and ends up in critical condition in the hospital. The doctor explains that Isaiah is going to die. Margot enters the hospital room and admits to an unconscious Isaiah that she shares his feelings. She then uses the book to revive him. In the final shot, Nathan goes to the hospital bathroom to wash his face and sees Kanduu's smiling face in the mirror instead of his own reflection. |
