Summary: Zoo features several tales of the macabre. In the first story, twin sisters who are treated very differently by their mother switch places with interesting results. In another segment, a group of people are held in windowless chambers awaiting death by a psychotic killer, and a young boy who has been captured with his sister moves from chamber to chamber through a narrow canal to visit with each captive to find out what's going on. In another segment a man and his girlfriend stop at an abandoned zoo on a whim, and he ends up killing her when she wants to break up with him -- only to return every day to take a picture of her as she decomposes.