In "Finding Nemo," the exposition is established in the beginning through a series of key elements that introduce the characters, setting, and background context. It begins with a flashback that shows Marlin, a clownfish, and his wife, Coral, as they prepare to start their family. Tragically, a predator fish attacks their home, resulting in the loss of Coral and most of their eggs, leaving Marlin to raise only one surviving egg, which he names Nemo. This event shapes Marlin's overprotective nature toward Nemo.
The exposition also establishes the underwater setting of the Great Barrier Reef and introduces the main characters, Marlin and Nemo, as well as their dynamic. Marlin's fears and anxieties are highlighted, setting the stage for the central conflict of the story when Nemo is captured by a scuba diver. This background helps the audience understand Marlin's motivations and the challenges he will face throughout the film.