Skye Rotter (Lauren McKnight) is on the run, having fled the Rollerdome massacre from My Super Psycho Sweet 16. With nowhere left to turn, Skye heads to the quiet town of Mill Basin and the mother who abandoned her years ago. There, she meets her younger half-sister, Alex (Kirsten Prout), and Alex's manipulative best friend, Zoe (Stella Maeve). Skye hopes she's finally found safety in her new family, but she's about to learn she can't outrun her past. While Brigg (Chris Zylka) desperately tries to locate her, Charlie Rotter (Alex Van) comes to town with one bloody mission: to turn Skye's upcoming birthday into a Sweet 16 she'll never forget. You're invited to the year's most killer party...as a weekend rager