Ally meets Austin outside, saying that she doesn't want him to have to choose between her and his career. At the event, Austin and Ally perform a duet together and Ally successfully conquers her stage fright. Meanwhile, Trish and Dez are addicted to a show called Crime and Judgement. However, Jimmy Starr tells Austin that he can't have a girlfriend as he has millions of teenage girl fans. Ten years later, Austin and Ally are married and have two children.
When they get there, Ally and Trish struggle to distract the guard while Dez sneaks past him. The bullying goes too far and Trish keeps on calling in sick every day to avoid going to school. 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. They choose the marriage assignment and are paired up together and have to create a fake wedding using a fake budget. Austin is backed into the position of having to choose between his friends and the promise of fame.
When Ronnie finds out the truth, Ally stands up to him. Trish decides to question each of Austin's previous romantic interests to try to prove he wrote the song about one of them, but, unfortunately, they have no luck. The two then share their third kiss and finally rekindle. The group quickly comes up with a solution and decides to take a cab to New York, but they're kicked off when they can't afford the fare for going a far distance. With most of the mall thinking that Austin is the culprit, the group must scramble to figure out who's really responsible.
Trish and Dez want both of their problems to be resolved. Meanwhile, Austin and Dez try to relax at a fake beach. The group and Dez's family decide to end Dez and Chuck's feud by putting them in a situation, where they must work together. When security won't let the group through the crowded streets, they bump into Jessie, a nanny, and Emma, a crazed fan. Trent quickly rises to fame and starts stealing Austin's life. However, since Ally is a horrible dancer she asks Austin to give her dance lessons, but accidentally breaks his leg during a practice.
She later finds out the events Dez has made her do don't happen in the book. At the end, it turns out the whole episode is Dez's actual short story. At the party Ally's songbook is stolen and a note is left saying that Ally has something that this person wants and that the songbook will have one page ripped out each day until there is nothing left. The group decides to host a fundraiser to raise the money and Austin is set to give a phenomenal performance in order to receive more donations. She seeks advice from Dr. Trish convinces the producers to give her a chance to prove herself, and has until Friday to prove that she can dance well.
First, Austin must answer a questionnaire, but Trish thinks he is boring so she decides to fill it out for him instead. Everything turns bad when the producer of the movie wants the song, but because of their disagreements, the song doesn't sound good. Trish later tells Ally that she is going to drop out of school. Austin isn't good at song-writing, and the only solution he can think of is to plead with Ally to write another song for him. There the group meets the rest of the Ross family: Luke, Ravi, Zuri, and Bertram. Trish and Dez decide to enter the dance competition together, but after they win they realize the prize money gets donated to the wood shop club. Trish gets booed at all of her performances and is very sad that she has nobody.
Meanwhile, Carrie reveals that she is moving to L. After saying she doesn't care, she goes into the school auditorium to cry. Austin and Ally are forced to perform for the Zaliens so they won't eat their brains, but they are then held captive by the Zaliens to be taken to their home planet. To make matters worse, Kira steps in on Trish's role as Ally's manager to book Ally a gig at a new beach club. Ally, Trish, and Dez run into the library to tell Austin who is eating pancakes the librarian made him. Afterward, the group does some sightseeing at a. However, when they try to stop him, they find out it's the wrong person.
Meanwhile, Trish and Dez, who have never gotten along, surprisingly discover they have things in common. Trish and Dez's ghost-hunting mission goes awry when they accidentally knock Taylor Swift unconscious. The group is devastated about her departure and they do not want her to leave. Afterward, Dez reveals to Austin that he is moving to L. At the interview before Austin goes on Ally: Ok so don't be nervous! Later, Ally gets the chance to perform a song in a movie, but Austin and Ally can't agree on how to genre the song. When Dez is determined to fire her, they discover that she is Jimmy Starr's daughter. Meanwhile, the psychic tells Trish that she'll meet a black haired well-mannered prince who happens to be a puppy whose name is Prince; Trish falls in love with him.
Trish organizes a radio interview for him, but he reveals he has never been in love, had a girlfriend, or been on a date, so he is exposed as a fraud. Ally and Trish find out Austin and Dez have read the diary and plan an elaborate scheme for revenge to teach Austin a lesson. He then decides it's best to stay out of the music business and reveals that he isn't broke. During discussing whether or not she should go with Trish, she admits that she still has feelings for Austin and she feels that Austin feels the same way and thinks that if they don't see each other for three months that their feelings can change. Jessie takes a helicopter to Times Square so Austin will be there on time.