This time, the X-VENTURE Xplorers find themselves in the Permian - Carboniferous periods, around 350 million years back. Many creatures which were small today were very big back then - which presents a huge problem when the X-VENTURE Xplorers come face to face with giant spiders and the like! As the situation worsens for the team, they quickly realise that it is a bad idea to be PLAYING IN THE PERMIAN!