In the time since the second movie of the series, Manny and Ellie are expecting their first child, even though Manny is not quite ready for fatherhood after his troubled childhood. Diego finds himself unable to catch a cocky gazelle and Sid finally finds his dream when he encounters three unhatched eggs. The next day, Sid's eggs hatch into baby Tyrannosaurus and despite his best efforts to raise them, their behavior proves too much for Sid and his friends. Sid and all his friends decide to go on a journey returning the babies to their own mother, who kidnaps Sid and takes him to a world below the ice after she thinks he kidnapped her children. Scrat returns along with a female counterpart named Scratte both in competition to keep one acorn to themselves.