Austin & Ally - Season 4 (2015)

The foursome's plans to enjoy their senior year together are put on hold when Austin learns that he's a credit short and has to retake a Spanish test. Meanwhile, Ally freaks out when she is partnered with Dez in chemistry class.

A self-taught violin virtuoso hires the A&A Music Factory to train her sister, an apparently talented sister who has been living under her shadow. However as they struggle to uncover what they believe to be the hidden violinist within, they find she has a completely different talent. Meanwhile Dez's efforts to help Trish with a video book report proves to be loaded with an elaborate costume, lots of dangerous stunts and blatant literary inaccuracies.

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. But later on, the foursome learns the famous duo have ulterior motives.

When Austin and Ally are paired together in Home Economy, they get to imagine life together as a married couple. Trish helps Dez book a job directing a commercial.

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.

The gang prepares for the A&A Music Factory's first showcase and Austin wants to surprise Ally by teaching their students one of her songs.

Ally is set to perform at an awards show, but the producers are concerned over her limited dancing skills.

A mystery unfurls when Ally's songbook is stolen from the school's '70s-themed party. The gang goes in search of the culprit.

A visit with a fortune teller convinces Austin that something bad will happen during his comeback concert. Meanwhile, Trish believes she is going to meet a prince.

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.

While visiting New York the group attends the Central Park Spooktacular, and it inspires them to tell their own scary stories.

When Ally is rejected from college, she decides to let go of her "perfect student" ways. Meanwhile, Austin and Dez discover their favorite childhood ride will shut down forever.

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.

One of Austin and Ally's music students is upset about spending Christmas away from her father, so the gang does everything they can to try and make her happy and realize that they're her family too.

As the rest of the group prepares for the next phase of their lives, Trish is still determining what her next steps will be.

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.