All-stars from the previous Step Up installments come together in glittering Las Vegas, battling for a victory that could define their dreams and their careers.

Wimpy Greg Heffley, now in seventh grade, thinks he has it all together. He has mastered middle school and gotten rid of the Cheese Touch. However, Greg's older brother, Rodrick, is itching to cut him down to size. He gets the perfect opportunity when their mother tries to force the boys to bond. Rodrick may be Greg's chief tormentor, but he feels his constant pranks are just what his little brother needs to prepare him for life's hard knocks.

Thanks to his police officer father's efforts, Shawn Spencer spent his childhood developing a keen eye for detail (and a lasting dislike of his dad). Years later, Shawn's frequent tips to the police lead to him being falsely accused of a crime he solved. Now, Shawn has no choice but to use his abilities to perpetuate his cover story: psychic crime-solving powers, all the while dragging his best friend, his dad, and the police along for the ride.