The Faculty (1998) (DVD)

When some very creepy things start happening around school, the kids at Herrington High make a chilling discovery that confirms their worst suspicions: their teachers really are from another planet! As mind-controlling parasites rapidly begin spreading from the faculty to the students' bodies, it is ultimately up to the few who are left--an unlikely collection of loners, leaders, nerds and jocks--to save the world from alien domination!