After Austin, Ally, Trish and Dez find a magical typewriter, it falls into the hands of a thief named Chuck, who uses it to mess with Austin and his friends, doing things such as switching their bodies, making Austin be unable to dance, etc. Will Team Austin be able to stop Chuck before he ruins Austin's career?

Ally is asked to be on a magazine cover, so she goes to Tranquility Spa, where Trish works. But when Trish isn't very good at her job, Ally may be humiliated. Meanwhile, when Dez tries to outdo Chuck in a chilli-making contest, Austin loses Ally's grandma's special necklace.

Spirit Week at school prompts Austin to join the Varsity basketball team.

Austin, Ally and Trish join Dez at a birthday celebration for Dez's younger sister, Didi.

Trish is organizing a Kids Club holiday party at which Austin and Ally will perform their original holiday song and distribute Austin Moon dolls, but a mix-up at the toy factory leads to a scramble. Meanwhile, Trish puts Dez and his arch nemesis, Chuck, through a competition to determine who will be a better Santa for the party.

Ally's record producer teams her up to write a duet with an artist, Gavin, which among other is in love with Ally. Austin becomes jealous and decides that he wants them to reunite, but Ally confesses that she now has a crush on the new guy.

Austin begins to realize he has stronger feelings for Ally than for Piper, when she says no to Gavin for prom.

Carrie threatens to tell her sister, Piper, that Austin would rather go to prom with Ally; Piper is already suspicious of Austin's feelings.

A mystery unfurls when Ally’s songbook is stolen from her school’s ’70s-themed party and the gang sets out in search of the culprit.

When a missing library book threatens to keep Ally from graduating, Austin tries to find it. Meanwhile, Trish fakes some memorable moments in an attempt to get more photos in the yearbook.

Years after the gang has gone their separate ways, Ally, Austin, Trish and Dez meet-up and learn what they have all been up to, individually.