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As the story unfolds, the peaceful existence on Bird Island is disrupted by the arrival of Leonard and his pig companions from Pig Island. At first, the visiting pigs appear friendly, but Red's instincts tell him otherwise. Their intentions come into question when Red discovers that the pigs have hidden agenda and are actually plotting to steal the birds' eggs.
Determined to get to the bottom of the pigs' plot, Red, Chuck, and Bomb embark on a quest to confront the legendary Mighty Eagle in hopes of acquiring assistance. Their journey leads them through various trials, including mistaken climbs up the wrong mountains and encounters with magical waters.