Unbeknownst to Ally, Austin and Dez "accidentally borrow" one of her songs, record it, create a video, and post it on the Internet; after which the song and Austin, become an overnight Internet sensation. When Trish convinces Ally to tell the world she wrote the song, Ally confronts Austin but he refuses to give her credit. However, when Austin is asked to perform another original song on the Helen Show the next day, Austin pleads with her to write another hit song for him and not create any fuss. At first she refuses but, after hearing about his dream in music, she agrees to work with Austin and the others as a team for the career of Austin Moon.
Trish is having a quinceañera, a Mexican party that celebrates a 15-year-old girl's coming of age. She mentions that one of her relatives, Emilio, a big-time club owner, will be at her party. Austin decides to perform at Trish's party, so he can impress Emilio to book him in his clubs. Trish invites Dallas to her party, so that Ally can dance with him. However, since Ally is a horrible dancer she asks Austin to give her dance lessons. Meanwhile, Dez attempts to prepare Trish's entrance to her party. In the end, the gang finds out that Emilio is actually a country club owner.
Ally is excited to find that "Miss Suzy's Soups" is owned by her favorite former music teacher, Miss Suzy. Ally is the only student or person that Miss Suzy never gave a gold star to so Ally sees a chance to finally earn one. When a gag photo of a giant plastic spider in a bowl of her soup goes viral on the internet it causes business to drop so much that Miss Suzy may have to close. The gang gets together to make her a commercial to save the business.
Trent asks Ally to write him a song so he can be famous like Austin. After Ally refuses to help him, Trent steals her newest song that she worked on with Austin. Later on, the gang discovers that Trent became an overnight sensation by copying Austin's "Double Take" music video and going by the stage name, T-Fame. Trent quickly rises to fame and starts stealing Austin's life. Now, the gang must find a way to take him down.
Austin, Ally, Trish and Dez travel to Times Square where Austin is booked to perform on New Year's Eve. When they couldn't get through New York City's crowded streets, fate brings the gang together with Jessie and Emma who help them get to the top of the building to perform by flying them in a helicopter.
Ally, Trish and Dez step in to help when Austin decides he wants to ask Jimmy Starr’s daughter, Kira, out on a date. Ally even agrees to go on a "practice date" with Austin, in order to help him plan out the perfect date for him and Kira. However, trouble and confusion arises when Ally falls for Austin in the process and decides to tell Trish about it.
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?
Austin and Ally go on their first date and agree to seperate their proffesional relationship from their personal relationship. They end up fighting and being to worreid about their relationship. They break up and remain as friends. Dez and Trish film their favorite scene from the Zalien's movies for a contest so Team Austin can see the new Zalien's movie early.
Ally decides to continue her career, and joins a band known as the Stray Kitties. However, it is a goth band, so Ally has to change who she is and become a goth. She's mostly fine with this change, but Austin, Trish, and Dez are against it, so she decides to quit the band- however they offer her a solo, and she doesn't want to turn it down.
Ally is nominated by Jon Paul Paul Jon as a nominee of "The Future Five". Each nominee must post a video of themselves online, but after Jon Paul Paul John says that Ally may not win due to her lack of dancing ability, her friends try to change her original decision to create a dance video. In the end, Ally ends up winning the contest and lets her friends know that she believed in herself. Meanwhile, Dez and Austin try to relax at a fake beach.
Austin writes a song about a girl and after it becomes a musical sensation, fans begin to question who it’s about. In response, Val sues Austin, Ally, Trish and Dez, claiming that the song was stolen from her newest artist and the matter heads to court where the foursome decides to represent themselves.
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.
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.
To raise money for Ally's charity, Austin agrees to be in a date auction. Dez says that he thought Ally would be upset at Austin going on a date with another girl, even though she said they are 'just friends'. But then a girl pledges $3,000 to go on a date with Austin, Ally gets into the auction herself. Ally pledges $3,001 to go on a date with Austin but gets beaten by the same girl by $5,000.
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!
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.
As her album is preparing to be released, Ally realizes that with all the time she's spending with her music, she won't have time to work at the store anymore, and is forced to quit, which allows Lester to finally sell the store- but when the gang finds out that the new owner, Ms. Krum, wants to demolish Sonic Boom to turn it into a box store, they must find a way to stop Lester before it's too late. Meanwhile, Carrie requests Trish and Dez's help to find a new job when she gets fired from Shredder's. In the end, Carrie starts working at Sonic Boom taking Ally's place, while she is promoting her album.
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.