Andy plunges into an underwater prehistoric adventure, 150 million years back in time, as he searches for a swimming reptile that's the size of an elephant! But after being chased by a scary shark, he finds himself lost at sea.

Andy travels 100 million years back to prehistoric times to meet the spinosaurus, a massive meat-eating dinosaur that is even bigger than the T rex! On his adventure, Andy rides a speedy ouranosaurus and takes a dip in a prehistoric river.