Sixteen years after the events of the third film, Manny and Ellie are forced to deal with the trials and tribulations of their daughter Peaches, who has trouble fitting in with her peers. Ellie tries to support her daughter, but Manny becomes exceedingly overprotective. Meanwhile, Sid's family returns, but only to drop off the elderly Granny before promptly abandoning them both. Manny then catches Peaches hanging out with a group of mammoths he does not approve of, causing a fight between him and Peaches. Shortly after, a sudden continental break-up (caused by Scrat trying to bury his acorn again) separates Manny from The Herd. Trapped on a moving chunk of ice with Sid, Granny, and Diego, Manny has no choice but to ride out the current. At the same time, a giant land shift encroaches on Ellie, Peaches, and those remaining on land, forcing them to make their way towards a land bridge in order to get to safety. Meanwhile Manny, Diego, and Sid set up their ice sheet as a ship and take off on a new adventure and a battle against a pirating group of hyraxes.