The movie follows Alvin, Simon, and Theodore as they race across the United States to stop their guardian, Dave, from proposing to his new girlfriend, Samantha. The Chipmunks mistakenly believe that if Dave gets married, he will send them away (a misunderstanding based on a comment from Samantha’s bullying son, Miles).
Here’s a concise summary of the story of Alvin and the Chipmunks: The Road Chip (2015): alvin chipmunks road chip