Alvin, Simon, Theodore, and the Chipettes set off on a luxury cruise for a vacation.
Alvin's antics lead to chaos aboard the cruise ship, resulting in consequences for the Chipmunks.
During a violent storm, Alvin and the rest of the group are washed off the ship and stranded on an uncharted island.
The Chipmunks and Chipettes begin exploring the island and look for ways to survive.
Various challenges arise on the island, including wild animals and natural obstacles.
The group works together to build a raft to escape the island and return home.
Alvin, Simon, Theodore, and the Chipettes successfully return from the island and resume their normal lives.
