Sonny with a Chance S01 E11 Promises, Prom-Misses

"She's in for the ride of her life."

When Sonny realizes she is missing out on that most important of teen milestones - prom - she decides to throw a prom for the cast, right there on set. But Marshall says a firm no. Will Sonny and her friends have a night to remember? Or is prom nothing but a distant dream?