Manny, Diego, and Sid embark upon another adventure after their continent is set adrift. Using an iceberg as a ship, they encounter sea creatures and battle pirates as they explore a new world.
When Scrat accidentally provokes a continental cataclysm with a storm, Manny is separated from Ellie and Peaches on an iceberg with Diego, Sid and Granny but he promises that he will find a way to return home. While crossing the ocean, they are captured by the cruel pirate Captain Gutt and his crew. However they escape and Manny plots a plan to steal Captain Gutt's ship and return to his homeland in a dangerous voyage through the sea. But the cruel pirates seek revenge againt Manny and his family and friends.

Mammoth Manny , the sloth Sid and the saber-toothed tiger Diego and others separated by a large flood , a glacier as a lifeboat . Began their epic journey at sea , they encounter the exotic marine life , and courageously fight the pirates found a magnificent New World .