Robert Rodriguez's spirited sci-fi/horror hybrid is one for the books, even if solely for rekindling the 'alien invasion' genre during the '90s. Taken over by alien parasites, this time it's high school teachers who can't be trusted anymore with a small group of students – amongst them soon-to-be famous faces of Josh Hartnett and Elijah Wood – discovering the terrifying truth. Kevin Williamson splendidly has his way with stereotypical teenagers in a clever script stuffed with titillating genre references. All performances are outstanding - particularly Robert Patrick eats up every scene he's in - and the K.N.B. Effects Group delivers some of their best work, mixing CGI with traditional monster mayhem. Even with its plot-twists revealed after a first time viewing, this one's worth revisiting.