When the chipmunks find a stray dog, the boys do everything they can do hide it from Dave so they can keep it; Theodore buys an egg online in hopes it will hatch into a dragon, but Alvin and Simon do not believe his wish will come true.
When Alvin attempts to help the Mathletes stand up to bullies, they take their newfound confidence too far. After witnessing what appears to be a wallet theft commited by Alvin's new friend, a foreign student named Emil, Simon and Theodore decide to investigate in hopes of finding answers - and, perhaps, justice.
After Brittany overhears Alvin standing up for her, she begins to behave in a peculiar manner that leads Alvin to believe that she has been possessed by a body-snatcher. To land Simon a position on the school newspaper, Alvin and Theodore search for a groundbreaking story, discovering some interesting things about their teacher in the process.
Kevin fears his birthday party will be lame so Alvin decides to host a paintball party in his house. After learning about Bocarter's New Computer, The chipmunks decide to build a bigger and better one in order to beat him at his own game.