While Scrat inadvertently causes the break up of Pangaea, Manny and Ellie are forced to deal with the trials and tribulations of their teenage 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 long enough to drop off the elderly Granny before abandoning them both. Shortly after, a sudden continental break-up 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. Meanwhile, a giant land shift encroaches on Ellie, Peaches, and those remaining on land, causing them to make their way towards a land bridge.