The Faculty (1998)

At Herrington High School in Ohio, it seems that overnight, the school's teachers and some top students become very strange. Originally kind, they are now cold and gloomy, and this situation seems to be getting worse. Problem students Casey (Elijah Wood Elijah Wood) and Delilah (Jordana Brewster Jordana Brewster) accidentally hide in the wardrobe and witness the brutal murder of nurse Rosa (Salma Hayek). But before long, Rosa appeared in front of the crowd intact, her expression as gloomy as any other teacher. Casey and others have come to realize that this series of events have something to do with some mysterious creature they have discovered, which now seems to be spreading at an unimaginable rate of terror. The danger is looming.