Andy heads 49 million years back in time to find out the colour of a prehistoric bird's eggs. But when he finally tracks down a nest, a new chick starts to hatch and he must protect it against a colony of supersized prehistoric ants.

Andy breaks a valuable museum artefact and has to travel back in time 30 million years to replace it. Landing in an age when giant mammals roamed the Earth, Andy tracks down the peculiar chalicothere and gets chased by a swarm of angry prehistoric hornets.