Teenage brothers Michael (Jason Patric) and Sam (Corey Haim) move with their mother (Dianne Wiest) to a small town in northern California. While the younger Sam meets a pair of kindred spirits in geeky comic-book nerds Edward (Corey Feldman) and Alan (Jamison Newlander), the angst-ridden Michael soon falls for Star (Jami Gertz) -- who turns out to be in thrall to David (Kiefer Sutherland), leader of a local gang of vampires. Sam and his new friends must save Michael and Star from the undead.

A half-mortal, half-immortal is out to avenge his mother's death and rid the world of vampires. The modern-day technologically advanced vampires he is going after are in search of his special blood type needed to summon an evil god who plays a key role in their plan to execute the human race.