Underwater cameraman, Bob Cranston explores a group of marine creatures called cephalopods that live in waters in various parts of the world. Cephalopds include such creatures as the squid, the octopus, and the cuttlefish and can display some bizarre behavior, such as cannibalism. Cranston interacts with some of these marine animals, including the dangerous blue-ringed octopus and the huge Humboldt squid.

The Red devil -- Dark cold waters -- Five hundred million -- A hot spot -- Australian Octopi.