Just before a big show, Jasmine breaks her arm causing the Major Eights to ask Leslie to stand in, but Jasmine worries the band will like Leslie better.
Keyboardist Jasmine, age eight, tries to convince her bandmates, Maggie, Becca, and Scarlet, to prove themselves in a Battle of the Bands competition, despite their poor equipment.
The fame the Major Eights experience after the Battle of the Bands competition goes to Scarlet's head and she signs up for the school's talent show as a solo artist.