|U.S. air date:||July 8, 2015|
|U.K. air date:||September 17, 2015|
|International premieres:|| Portugal: April 12, 2015|
Australia: April 2015
Bulgaria: May 12, 2015
Poland: May 13, 2015
Netherlands: May 20, 2015
Spain: July 11, 2015
|Written by:|| Ben Bocquelet|
|Storyboarded by:||Adrian Maganza|
"The Triangle" is the 39th episode of Season 3 of The Amazing World of Gumball.
Darwin joins the school marching band, as Darwin discovers a talent he never knew he had. Everyone accuses Gumball of being jealous.
The episode starts out with the students getting their insterments for the school marching band, and Gumball asks Principal Brown what his instermant is, which is a triangle. Darwin gets a swanee whistle and plays a beautiful merrily tune, surprising the students and Principal Brown, and as a reward, Darwin joins the solo in the marching band, but Gumball is accused of being jealous. Darwin then tells Gumball to come back when he's not jealous. At the cafeteria, Leslie was impressed with Darwin's new solo. Darwin then starts to hallucinate about naked people. Embarressed, Darwin tells Leslie that he will play his whistle outside. But, Gumball comes back and tries to hold Darwin back while getting to the practice. Principal Brown tells the two that they are night in time. Leslie inserts gum on the whistle. Darwin tried to play his whistle again, but the bubble grows out of his whistle and pops his face. Principal Brown said that someone has been sabotaging his whistle, and points to Gumball and Prinicpal Brown thinks Gumball's sabotaged everyhting. Gumball tries to protest, but Principal Brown tells him he's banned from the band and he's done raining on their parade, and Darwin took Gumball's triangle away from him, much to dismay. Outside the stadium, while the band continues to play, Gumball suddenly realizes that Banana Joe is jealous, not just him. He thinks it's Banana Joe who's jealous. In the men's and boys' locker room, Gumball attempts to apologize Darwin, but got thrown out by Principal Brown, threatening to expel Gumball from school. Suddenly, Gumball notices a duck costume walking into the bathroom and steals the costume, revealing an real Duck named Archie. Outside the studium, there was fans cheering on for the marching band. Gumball, disguised as Archie the Duck attempts to warn Darwin for somebody else being jealous of him. It turns out that it was Leslie who's trying to sabotage Darwin. Gumball and Leslie put up a fight, but Gumball kicks Leslie out of the marching band and attacks Leslie for instering the gum in Darwin's swanee whistle and saboting everything and they soon realized their mistakes and decided to watch Darwin play his solo. Darwin tries to play beautifully, but play scratchy notes on his flute, and the audience booed at him and called him terrible and Leslie and Gumball cheered.
- Banana Joe
- Principal Brown
- Mr. Small
- Miss Simian
- Sphere Citizens
- Hatchi the Duck
- Smelly Cheese
- This episode, along with "The Downer," "The Egg," and "The Money" aired in multiple countries before it did in the US.
- However, it aired in the UK along with Spain after it aired in the US.
- The fourth wall has been broken when the screen zooms Banana Joe's face and breaks.
- This is the second time Gumball uses the triangle. The first was in "The Fridge."
- This is Leslie's second major role. The first major role was in "The Flower."
- Leslie mentions he was "discarded like a slice of pickle on a cheeseburger" due to Darwin's solo, a possible reference to "The Ghost," where Carrie takes the pickle out of her cheeseburger in Gumball's body.
- The song that Darwin plays for an audition is "Clair de Lune" by Claude Debussy.
- The school mascot, Archie, somewhat resembles Donald Duck.
- Gumball and Darwin "communicating" through whistles may be a reference to the childrens' show Clangers.
- In fact, Principle Brown gave Darwin a swanee whistle, which is the whistle used to "voice" the Clangers.
- In one scene, Carmen and Teri appeared in the boys' locker room, Even though she's a girl.
- Sussie is part of the marching band, but dosen't appear at the parade.
- The water in the school hall from Sussie's tears disappears after the close-up shots of Gumball and Darwin.
- When Mr. Small is picking up Darwin's peas, the bowl becomes full when only a few were put back.