When a new threat emerges that puts both Bird and Pig Island in danger, Red, Chuck, Bomb, and Mighty Eagle recruit Chucḱs sister Silver and team up with pigs Leonard, his assistant Courtney, and techpig Garry to forge an unsteady truce and form an unlikely superteam to save their homes.

On an island populated entirely--or almost entirely--by happy, flightless birds, Red, a bird with a temper problem, speedy Chuck, and the volatile Bomb have always been outsiders. But when the island is visited by mysterious green piggies, it's up to these unlikely outcasts to figure out what the pigs are up to.