Austin strains his vocal cords while rehearsing for his demo record, so he goes to see his doctor and learns he has a big decision to make.

Ally accidentally gives away all of the instruments in the Sonic Boom so Ally, Austin, Trish and Dez decide to host a fundraiser in order to get the money needed to buy the instruments back. However, when Austin gets grounded for bad grades, the gang is left needing a backup plan.

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.

The gang shares an emotional reunion in Miami at Ally's triumphant homecoming gig. When Austin learns that the foursome's time together is only temporary, he contemplates enrolling in military school.

Unable to find a new passion, Austin feels forced to take a job at his parents' mattress store, and Ally struggles to keep up with an influx of music students. Dez and Trish try and help the duo to come up with a plan that will solve both of their problems.