Ænigma

When a group of popular kids at St. Mary's College play a cruel prank on the unattractive school weirdo, Kathy, they leave the poor girl in a permanent coma. When beautiful new girl Eva arrives at the school she's given Kathy's old room and it isn't long before strange occurrences are afoot and bodies are piling up. Kathy has possessed Eva and is using her as pawn in her quest for bloody revenge.