To the Beat follows Mia and Mackie Castillo, 14-year-old twins who have been dancers since they were toddlers. That has been their sole focus since they were three years old. Despite the fact that they dance in distinct styles, they support each other throughout contests and practices. Mackie enjoys jazz and Mia enjoys tap. When their favorite pop musician holds an online contest to identify the most unusual dance group for his new music video, the twins organize their own teams to compete for the chance to perform in it, enlisting the support of their friends and family to garner online votes. Meanwhile, their arch rival and neighbor, Avery, the best dancer of them all (who also knows it), utilizes her charm and resources to gain an advantage in the battle.