In this episode, Planet Earth grows to outlandish proportions causing lying down to become the new standing up, the sun gets big ideas giving us a 20,000 year winter before blowing up in the biggest explosion since the big bang, we meet a dog the size of a dinosaur and Joe himself turns into a 15m giant. Along the way, we take a ride in a Eurofighter typhoon to find out what 10G feels like, sit on a giant pumpkin and meet the world’s tallest man. Which all goes to show that size really does matter.