Planet Dinosaur

Season 1

Episode 4: Fight for Life

The documentary series reaches the Jurassic period, when the first giant killers stalked Earth and lurked in the seas. North America was dominated by the allosaurus, an ambush hunter with a lethal bite, allowing it to bring down even the heavily armoured stegosaurus. Life in the oceans was just as deadly - a fossil found in the Arctic in 2008 turned out to be a colossal marine reptile. Named Predator X, the creature was 50ft long, weighed 45 tons and had a bite force unmatched by anything in the Jurassic seas