Turning of age, Y/N. becoming an adult (19+) as she still hasn't found herself or anyone like her, but as she continues her journey with her herd, with Ellie and Manny who is expecting their first mammoth baby. As the couple prepare excitedly for their new arrival, Diego question his role in the herd that he has have grown to love. wondering whether this is the time for him to explore the world and Sid finds trouble when he adopts three abandoned eggs to create a ready-made family. Chaos ensues when the eggs hatch and three baby dinosaurs are born. Sid loves his new role as 'Mummy' but things get complicated when the dinosaurs' real mother comes searching for her babies.