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The Chipmunks come to believe that Dave is planning to propose to his new girlfriend in Miami and get rid of them afterwards. In an attempt to stop him, they go on a road trip, with a time limit of only three days.

In June 2014, 20th Century Fox announced that a fourth installment, Alvin and the Chipmunks 4, would be released on December 11, 2015. In August 2014, Randi singer signed on to write the fourth installment. On December 18, 2014, it was announced that Walt Becker signed on to direct and that the film would be released on December 23, 2015. It was also announced that the film would be titled Alvin and the Chipmunks: The Road Chip.