The meeting in the previous episode unintentionally changed the composer Dave Seville (Jason Lee) and three lovely chipmunks, Irwin (voiced by Justin Long), Simon (voiced by Matthew Gray Kubler) and Theodore (voiced by Jesse McCartney). They traveled together to enjoy music, and of course made a lot of trouble and jokes. Dave, who was accidentally injured, entrusted the three little guys to Aunt Jackie and went through the enrollment procedures for them. But Aunt Jackie also had an accident, and Irwin and the others had to mix with Dave's out-of-the-box nephew Toby (Zachary Levi) and start school life. They also met three other beautiful and lovely little chipmunks, Brittany (voiced by Christina Applegate), Eleanor (voiced by Amy Poehler) and Janet (played by Anna Faris). Interesting, wavy...