"Mission Monkeys: Costume Switcheroo," which details the adventures of four characters—Mila, Milo, Mia, and Mik—at the Harvest Hollow Costume Carnival. The narrative centers on a magical mirror that mistakenly switches their carefully chosen parade outfits into bizarre new costumes, such as a ballerina bunny and a taco, after Mik impulsively uses it. The monkeys discover that the magic word "banana" triggers another switch every time it is spoken, forcing them to be careful with their language.