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.

The gang imagines how their lives would be if they’d never met Austin.

Following the last show of Austin’s tour, the gang does some sight-seeing at a Washington D.C. museum, where Austin accidentally gets stuck to a priceless object and must find a way to return it before performing for the President.

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.

Austin, Ally, Trish and Dez team together to try and win a Glee Club competition.

Ally takes on an alias in order to continue to be Austin’s song writer.

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.

Trish gets a visit from a boy she is crushing on and she acts strangely when he asks her out on a date, she seeks advice from Dr. Cupid, who is actually Dez.

When Austin receives his first negative review from a critic and falls into a slump and is afraid to perform on stage, Ally, Dez and Trish try to relieve him from it.

Dez gets an unexpected opportunity to direct a movie that Austin is in, but things prove problematic when he has to work with Austin’s co-star, Brandy Braxton, a high-maintenance actress.

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.

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Ally, Trish and Austin are surprised to learn that Dez's relative is not only a famous basketball player, but also an avid Austin Moon fan.

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!

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.

Austin disappears before his performance on "Video Countdown Live"; the group finds out that Brooke is holding him hostage until he writes her a song.

Trish gets the lead role in the school play; she quickly drops out when she finds out someone is mocking her on the internet.

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.

Austin and Ally's relationship hits another road block when his music label forces him to hide their relationship from the public. Meanwhile, Dez contemplates moving to L.A. in an effort to be closer to his girlfriend and attend film school.