In "The Spoiler," Gumball and Darwin want to see it but lack the money for the tickets. Anais offers to buy the tickets for them if they bring her along, but the boys refuse, deciding instead to wait until Friday when they get their allowance.
Throughout the week, several people talk about the movie around Gumball, nearly spoiling the movie for him. Eventually, they get their allowance and go to see the film. Anais sneaks into the theater with them and attempts to record the film to watch later.
Unfortunately, Larry catches her and chases the trio across the aisles. They manage to escape by spoiling the ending for the movie-goers and getting lost in the leaving crowd.
The movie is about a dentist and his wife hiding in a remote cabin in the woods from the dentist's crazy uncle. Many things go wrong, however: the cabin is built on an ancient cowboy burial ground, their car breaks down, a demon baby is living in the cabin's cellar, and the wife gets possessed.
Near the end of the film, it is revealed that the demon baby was just a figment of the dentist's imagination because he had seven split personalities, and that every character in the movie was one of them.
- According to Gumball, this is the only film in ten years that is not "a remake, a sequel, a remake of a sequel, or a prequel of a sequel of a remake."
- The movie's title may be a reference to the Shyamalan film The Happening.