Watch Prom for Free: How to Stream the Movie Online at 123Movies. . At “Prom,” every couple has a story and no two are exactly alike. As the big dance approaches for Nova Prescott, it’s a battle of wills as she finds herself drawn to the guy who gets in the way of her perfect prom. Fellow seniors Mei and Tyler harbor secrets, while others face all the insecurity and anticipation that surrounds one of high school’s most seminal events.