The fourth instalment in the teen dance drama franchise. Kathryn McCormick stars as Emily, a girl from a wealthy family who arrives in Miami hoping to become a professional dancer, and soon falls for poor boy Sean (Ryan Guzman), leader of flash mob street dance crew MOB. When Emily's father, a major property developer, threatens to build on the historic neighbourhood that is the MOB's home, Emily asks Sean and his crew to use their performance mobs to protest against the planned development. But they soon discover that engaging in such political activity could jeopardise the MOB's chances of winning the major contest that could bring them the sponsorship they need to hit the big time.