Diego and Sid couldn't be happier for their friend Manny—he's about to become a dad! Manny's been so busy getting ready for the baby that he doesn't notice when he hurts his friends' feelings. But when Sid gets kidnapped by a crazed dinosaur, Diego and the dad-to-be have to put aside their differences and focus on one thing—going on an incredible journey to a dangerous new world and bringing Sid back!