When Ally's new record label prohibits her from writing any more songs for Austin, Austin must look for a new songwriter. So Ally dons a disguise to become Austin's new songwriter.
When Gus becomes sick, he becomes evil and the boys need to sneak him into Mighty Med to cure him.
While Timeline is in the hospital, he tells Kaz about the future which endangers the world by fulfilling a prophecy.
Kaz and Oliver try to teach Skylar about pranking and it backfires on them when The Great Defender is involved. Meanwhile, his daughter teaches Alan a lesson.
Kaz accidentally shrinks Oliver and then breaks the machine. With Oliver small, it is up to him to stop the villain Micros.