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The vacationing Chipmunks and Chipettes are turning a luxury cruise liner into their personal playground, until they become 'chipwrecked' on a remote island. As the 'Munks and Chipettes try various schemes to find their way home, they accidentally discover their new turf is not as deserted as it seems.

On vacation aboard a luxury cruise ship, Alvin, Simon, Theodore and the Chipettes are up to their usual antics, turning the ship into their personal playground, until they become 'chipwrecked' on a desert island. As Dave Seville frantically searches for his AWOL charges, the 'Munks and Chipettes do what they do best – sing, dance and wreak havoc. But they're in for a surprise when they embark on an island adventure with their new friend – a castaway who's more than a match for Alvin and the Chipmunks.