Based on Welcome to Camp Nightmare, book #9 of the original Goosebumps series.
Billy is sent to Camp Nightmoon for the summer, but soon strange events start happening.
The episode provides examples of:
- Adapted Out: The episode removes the section with two campers named Tommy and Chris.
- Adaptational Early Appearance: In the book, Roger is introduced in the middle of the story while in the episode he's introduced along with the other campers at the starts.
- Adaptational Jerkass: While Larry was a jerk in the book, the episode pumps it up more. In the book he softened up when Billy saves him. In the episode this doesn't happen and in fact, when some of the kids get in danger he runs away and pretends he was never there.
- All There in the Manual: The Goosebumps Presents book reveals that Billy's last name is Harlan.
- Angry Item Tapping: Billy begins to suspect that something is wrong with the camp. He arms himself with a baseball bat and taps it in his hand.
- Bowdlerise: The guns in the climax are changed to crossbows. Uncle Al's rifle that he uses to scare off Sabre at the beginning is also changed to a Flare Gun that shoots ridiculously explosive flares.
- Canon Foreigner: George, a member of the staff who works on electronics, is added for this episode.
- Hollywood Tone-Deaf: Uncle Al and the rest of the campers singing "Nightmoon, oh Nightmoon".
- Mix-and-Match Critters: Sabre in this version is a wolf-gorilla thing.
- Named by the Adaptation: This episode gives Billy a surname: Harlan.
- Real After All: In both the book and the episode, Sabre is thought to be just a scary story. While we never find out he's real or not in the book, the episode explicitly shows him although he turns out to be a robot.
- Sci-Fi Writers Have No Sense of Scale: In the conclusion, it's revealed that the camp was on another planet, and all of the characters are aliens who are training to visit/invade Earth. Only we see Earth hanging directly in the sky above them, and the only way it could appear that close is if the camp was actually on the moon. Then again, it is called "Camp Nightmoon", so maybe...
