One day, Alvin was alone in his room. Then, a chipmunk from another world that looks like him tells him he has to go on a very important mission. But Alvin is not allowed to tell anyone about it. Little does Alvin know, the very fate of both worlds rests on his shoulders.

Alvin and Carter are home alone when the zombies come. Alvin finds Theodore's teddy bear in his room. He promises to save him. Meanwhile, Simon and Jeanette try to find more information about these zombies. Eleanor survives with her basketball team and learns the true meaning of teamwork. Brittany and a young boy must work together despite their differences. But where is Theodore?

"All I want is to be accepted," I finally admitted. All Alvin, Simon and Theodore wants is to be accepted into a home. But life for orphan talking chipmunks is a rough road. When Theo gets accepted into a famous popstar's home, and Simon and Alvin don't, all three brothers go separate ways. Will Alvin ever be accepted and have a home with someone? Rated T for caution.