A comedy about the unique relationship between a young songwriter, Ally Dawson, and Austin Moon, the overnight internet sensation who gains sudden notoriety after performing one of Ally's songs. Austin and Ally struggle with how to maintain and capitalize on Austin's newfound fame. Austin is more of a rebel type who doesn't follow the rules and is somewhat immature for his age, while Ally is conservative yet self-conscious.
Austin and Ally are asked to be celebrity judges on a singing competition show that is celebrating "Austin Moon Week." Ally takes a contestant under her wing that reminds her of her former, shy self and she and Austin work to make the girl a top contender. Meanwhile, Trish and Dez try and create the most impressive fan signs in an effort to be seen on TV.
After missing most of Austin's tour to focus on her music career in Miami, Ally longs for her friends and decides to catch Austin's performance in Portland. Ally barely makes it on time, and is now torn between continuing to work on her own music, or joining her friends for the last leg of Austin's tour.
When Dez, Trish and Austin convince Ally to attend the annual Zaliens Convention that's being held in Miami, Trish and Dez happen to stumble upon real Zaliens who are planning to destroy the Earth- in order to save it, Austin and Ally must perform their new song to satisfy them, but end up becoming their musical captives!
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.
The foursome's plans to enjoy their senior year together are put on hold when Austin learns that he's a credit short.
Austin and Ally spend time together to try to get to know each other more.
When the gang prepares to go to Jimmy Starr's Halloween party a power outage leaves the four friends locked in Sonic Boom. They pass the time by holding a contest to see who can tell the scariest ghost story.
Trish gets the lead in the school play, but ends up getting bullied online with comments telling her that she's not pretty. After saying she doesn't care, she goes into the school auditorium to cry. She is later caught by Ally crying while reading hate comments about her. Austin, Dez, and Carrie follow, hugging her for comfort while she cries. The bullying goes too far and Trish keeps on calling in sick everyday to avoid going to school. Trish later tells Ally that she is going to drop out of school. Ally tells Austin and the two make a song and Austin preforms it at Shredders. However, Trish still refuses to go to school. It is play night and Carrie and Dez figure out the bully is Margo. After Dez and Carrie put a skunk in Margo's face, Trish gets upset with them getting back at Margo. Trish informs Coach Simmons about the problem and nicely tells Margo to stop. Margo apologises revealing that she was jealous of Trish and promises to stop posting hate. The play continues and nobody makes fun of Trish anymore.
Desperate to perform again, Austin begins singing at a karaoke club in disguise. Back at the A&A Music Factory, Ally mentors a student with stage fright.
A top music manager wants to represent Austin, but none of his friends are invited.
While visiting New York the group attends the Central Park Spooktacular, and it inspires them to tell their own scary stories.
Trish books Billie and Bobbie of "The Billie and Bobbie Show," a famous brother and sister duo, to talk and perform with the students of the A&A Music Factory. Meanwhile, when a code inspector comes to look at the music school and threatens to shut it down, the foursome learns the famous duo have ulterior motives.
When Austin disappears before his scheduled performance on “Video Countdown Live,” the gang soon discovers Brooke is holding Austin captive and threatens to hurt him and the gang unless he writes a song for her. So Ally, Dez and Trish have to find a way to help him.
Austin, Ally, Trish and Dez are excited to make their first big budget music video, but when Kira, a girl with terrible breath, gets hired to play Austin’s love interest, the gang must find a way to finish the video without hurting Kira’s feelings.
When Trish’s boy-band client “Boynado” threatens to split up, she searches to find a way to fix their problems. Meanwhile, Austin and Ally try to help a former impersonator find his own voice.
Ally learns that the new woman her Dad is seeing also happens to be the mom of a very difficult student at the A&A Music Factory.
Ally wants to prove to Austin that she can unlock the hidden musical talent of a new student.
The gang imagines how their lives would be if they’d never met Austin.
Dez and Trish find strange props for the video but must resolve the mix-up.
Ally is performing at an awards show but the producers are worried about her dancing abilities.
When Austin and Ally are paired together in Home Ec, they get to imagine life together as a married couple. Meanwhile, Trish helps Dez book a job directing a commercial.
Jimmy signs his daughter, Kira, as the newest recording artist to his label. When Kira has her first performance, she wants to sing one of Ally's songs, but Ally wants to sing it herself; Austin accidentally records over one of Kira's demos.
Austin must prove that he's not shallow to impress a girl he wants to take on a date.
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 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.