It's the senior prom at Waterloo Road, and Darius is closer than ever to landing the top job. But as Nisha begins to see him in a new light, she grows uneasy about what he may have done to get there. Meanwhile, Freddie's surprise for Luca backfires, Ashton and Shola's plans are shaken by a familiar return, and Stace's big day descends into chaos when her bridesmaids choose the prom over her wedding.