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Alvin struggles to keep a promise not to see a new movie until Simon is well. Alvin becomes trapped in Simon's newest invention: an invisibility suit. The gang tries to find out what Theodore's "wish upon a star" was. Jeanette and Bocarter clash over what's better for the school: a garden or vending machines.

Alvin finds a treasure map in Miss Croner's basement. Miss Smith investigates why the school fire alarm went off and gets very different stories. Alvin and Theodore try to protect everyone from zombies.

The Chipmunks help the owner of a run-down summer camp make repairs. Jeanette and Alvin accidentally switch bodies and must live as each other. Alvin cannot tell a lie after dreaming that he drank a truth serum. Theodore creates a fake identity as a girl online so Cheesy can have a girlfriend. Alvin and Brittany try to rescue Simon, who seems to be lost in time. Alvin makes a prank call, but the person who answers vows to find him. One man has his hands full trying to raise six spunky chipmunks who have a habit of having fun and getting into trouble at the same time.

Alvin and Simon rewire Theodore's talking teddy bear to respond to commands. Alvin doesn't want to go back to school until he meets the new principal. Believing that Theodore has been kidnapped by aliens, Alvin and Simon prepare a rescue mission. The Chipmunks create a magical birthday for Jeanette. After fighting with Brittany, Eleanor moves in with Alvin and his brothers. When Theodore's rap video becomes a hit, he considers a solo career. Alvin thinks that a neighbor is responsible for a recent jewel heist.

Alvin tries to get out of the annual family day picnic to attend a soccer game. Alvin tries to escape from the control of Dave's new parenting app. Theodore gets confusing dating advice from his family members. Alvin takes a personality test and discovers that his true soul mate is Brittany.

Simon and Alvin announce rival campaigns for class president. Elected school safety monitor, Simon must make a hard choice about punishing Alvin. Dave takes the Chipmunks on a technology-free camping trip. Theodore becomes frozen like a statue when Alvin scares him. Simon constructs a robot bodyguard to protect him from the school bully.

Jeanette wants to give a toast at Brittany's party, but she's too shy. Alvin tries babysitting as a way to make money for a new video game. To break a curse, Theodore looks for Miss Croner's missing cat. When Dave gets a cold, Alvin fills in and discovers that it's hard to be a dad.

Dave is worried about the Chipmunks' addiction to a video game until he gets hooked on it, too. Theodore spends Alvin's skateboard money on candy. Alvin quickly regrets it when he gives away his lucky cap to a fan. Alvin goes to the zoo in costume and is mistaken for a real Tasmanian devil. When Dave decides to spend more time with them, the annoyed Chipmunks try to find him a girlfriend.

The Chipmunks accidentally ruin Dave's new song. Simon builds a fast replica of a toy sports car for Alvin. To earn a meeting with a real princess, Alvin must pass a course in good manners.

The Chipettes recall the origins of their treehouse. Alvin and Theodore think that Simon is being sent to boarding school and try to stop it. Dave returns to high school with Alvin in order to complete his education. Simon's new friend Jamie ditches him in favor of the more popular Alvin. Alvin proves he's big enough to get his own room, but finds it lonely.

The Chipmunks enter a contest to win Theodore a new bicycle. The gang joins in a green living competition to reduce their carbon footprint. Alvin babysits a talking myna bird for a girl he likes at school. Simon and Alvin must convince Theodore that he's not a real superhero. Brittany thinks Jeanette lacks style until Jeanette is declared a trendsetter.

Simon is too shy to kiss a girl in the school play, so Alvin switches places with him. Alvin decides to rent out the house while Dave's away. A science project gone wrong turns Theodore into a giant. Alvin gets blamed when someone steals his classmates' smartphones. Alvin helps the gang gear up for a soccer game, but they want to replace him as coach. Alvin decides to become a reality television star.

Alvin and Brittany eat a cake that Eleanor wanted to enter in a baking contest. The Chipmunks pretend that Dave's dream house is haunted. Alvin gets himself into a sticky situation when he lies to Theodore about having secret powers. Simon competes against Derek in a reality TV show. Brittany takes up painting, hoping to impress her fashion idol.

Alvin ruins Brittany's favorite bag and must figure out a way to replace it. Alvin gets attached to a baby bird that fell out of his nest after the Chipmunks rescue him. Alvin tries to stop Julie and her son from moving in. When Alvin and Dave spend a weekend together, things get wild! An accidentally hypnotized Simon experiences a day of lowered intelligence. Alvin uses a high-tech "nano-phone" to eavesdrop on others. The gang believes a fabled Halloween character swapped their candy for books and fruit.

Alvin breaks into Simon's secret lab and accidentally clones himself. Alvin's lie about a brother who's a famous race car driver spins out of control. An endangered species of toad becomes attached to Brittany's face. Kevin has a crush -- and the Chipettes think it's on one of them.

Alvin writes an angry email to a teacher from Simon's computer, then accidentally sends it. Overwhelmed by favors for others, Theodore can't say no. After Theodore gives his principal a music box, Dave reports it stolen. Theodore hides in a box, but it's really a mail parcel that gets shipped away. Frustrated by Alvin, Miss Smith quits -- but the new teacher is much worse. The boys tease the Chipettes about being scared by a movie.

The Chipettes decide to prove that all not superheroes are guys. Miss Smith tells Alvin that he must pass an important test or repeat the school year. Alvin wants to host an awesome paintball party without Dave knowing about it. The Chipmunks try to keep up with a neighbor's cool video game.

The Chipmunks compete against a new boy band. The principal tells Alvin and Derek that the school dance will be canceled if they fight one more time. When Brittany is hurt, Jeanette fills in as the principal's new assistant. Alvin and Dave compete against Bocarter and his dad on a school project. Inspired by a legend, Theodore does good deeds like a Knight of the Round Table.

Alvin and Simon try to help Dave get over his fear of snakes. The boys try to top the girls after the Chipettes make a viral video. Alvin struggles to keep a promise not to see a new movie until Simon is well. Alvin becomes trapped in Simon's newest invention: an invisibility suit. The gang tries to find out what Theodore's "wish upon a star" was.

Jeanette and Bocarter clash over what's better for the school: a garden or vending machines. Alvin finds a treasure map in Miss Croner's basement. Miss Smith investigates why the school fire alarm went off and gets very different stories. Alvin and Theodore try to protect everyone from zombies. The Chipmunks help the owner of a run-down summer camp make repairs.

Jeanette and Alvin accidentally switch bodies and must live as each other. Alvin cannot tell a lie after dreaming that he drank a truth serum. Theodore creates a fake identity as a girl online so Cheesy can have a girlfriend. Alvin and Brittany try to rescue Simon, who seems to be lost in time. Alvin makes a prank call, but the person who answers vows to find him. One man has his hands full trying to raise six spunky chipmunks who have a habit of having fun and getting into trouble at the same time.

Alvin and Simon rewire Theodore's talking teddy bear to respond to commands. Alvin doesn't want to go back to school until he meets the new principal. Believing that Theodore has been kidnapped by aliens, Alvin and Simon prepare a rescue mission. The Chipmunks create a magical birthday for Jeanette. After fighting with Brittany, Eleanor moves in with Alvin and his brothers. When Theodore's rap video becomes a hit, he considers a solo career.

Alvin thinks that a neighbor is responsible for a recent jewel heist. Alvin tries to get out of the annual family day picnic to attend a soccer game.

Alvin tries to escape from the control of Dave's new parenting app. Theodore gets confusing dating advice from his family members. Alvin takes a personality test and discovers that his true soul mate is Brittany. Simon and Alvin announce rival campaigns for class president. Elected school safety monitor, Simon must make a hard choice about punishing Alvin. Dave takes the Chipmunks on a technology-free camping trip. Theodore becomes frozen like a statue when Alvin scares him.

Simon constructs a robot bodyguard to protect him from the school bully. Jeanette wants to give a toast at Brittany's party, but she's too shy. Alvin tries babysitting as a way to make money for a new video game. To break a curse, Theodore looks for Miss Croner's missing cat. When Dave gets a cold, Alvin fills in and discovers that it's hard to be a dad. Dave is worried about the Chipmunks' addiction to a video game until he gets hooked on it, too.

Theodore spends Alvin's skateboard money on candy. Alvin quickly regrets it when he gives away his lucky cap to a fan. Alvin goes to the zoo in costume and is mistaken for a real Tasmanian devil.

When Dave decides to spend more time with them, the annoyed Chipmunks try to find him a girlfriend. The Chipmunks accidentally ruin Dave's new song.