A gregarious gorilla named Pete and his gorilla companions who live in the zoo are bored and tired of doing the same old thing night after night, so they sneak out in search of an adventure that is sure to excite. Their adventure brings them to different spots in the city where they get into a lot of mischief and "monkey business". While on their quest for fun they do some shopping at the fanciest of stores, eat massive amounts of ice cream, and perform gymnastics in what they think is an empty gymnasium. But, their adventure is abruptly cut short when they are discovered monkeying around by a night watchman. Will the gorillas find a way to get back to the zoo before morning? Gorillas' Night Out is a humorous tale about just how far a gorilla will go in pursuit of the ultimate night on the town.