Through a series of misunderstandings, Alvin, Simon, and Theodore believe their longtime caretaker Dave is about to propose to his new girlfriend — and that he’ll send the Chipmunks away. To stop the proposal, they race across the country in a wild road trip to reach Miami before Dave pops the question. Along the way, they dodge an aggressive air marshal, cause chaos on a plane, and get chased through Mardi Gras. But as they learn more about family, they realize things aren’t always what they seem.

is the fourth and final live-action/CGI film in the Alvin and the Chipmunks franchise, released on December 18, 2015 . Plot Summary

The movie follows Alvin, Simon, and Theodore as they embark on a cross-country road trip to Miami. They believe their father figure, (played by Jason Lee), is going to propose to his girlfriend, Samantha , and subsequently abandon them. To stop the proposal and save their family, the Chipmunks team up with Samantha's son, Miles , despite their initial mutual dislike. Characters & Cast