After saving Bird Island from an all-out green-pig invasion in The Angry Birds Movie (2016), the isle's always cranky local hero, Red, still finds himself doing battle with Pig Island. As the prank war between pigs and birds is raging, massive icy projectiles coming from the feathery tyrant Zeta's ice-capped Eagle Island threaten the security of both havens, unless Red and King Leonard agree to form a difficult but honest truce.