Andy travels back 70 million years to meet the miniature magyarosaurus, a relative of the giant sauropod dinosaurs, which grew no bigger than a pony. But when he arrives on their prehistoric island home, he has to shrink down as well to hide from a giant flying reptile as tall as a giraffe.

Andy dons his winter coat and heads off on another prehistoric adventure, this time back 30,000 years to the last ice age. On his travels he is stalked by a cave lion, before joining some woolly mammoths on their annual migration and helping out one of the herd when they fall through a hole in the ice.