Science fiction writers have come up with strange depictions of alien life, but nothing to rival creatures with a beak like a parrot, no bones, three hearts, blue blood, skin that can change colors and arms growing out of lips. Scientists call them cephalopods (squid and octopus); they inhabit a world where cannibalism is a daily practice, mating can involve amputation, trickery is rife and size means everything - and nothing. Viewers follow a cameraman into the abyss and share his adventures with the planet's most cryptic and clever monsters.