LD 50 Lethal Dose (2003)

Director: Simon De Selva
Cast: Katharine Towne, Leo Bill, Mel B, Philip Winchester, Ross McCall, Stephen Lord, Toby Fisher, Tom Hardy

Synopsis:

Re-formed by a coded message to their web site, a group of animal rights activists set off to free an imprisoned colleague from a terrifying ordeal. Their rescue mission leads them to a disused lab, but what should have been a simple raid turns into a series of twisted and mind bending incidents where the free and the caged switch places, in this tormented psychological horror.