Bill, Gary and Ruby head to a massive crater so alien, it was used by NASA to train for the moon landings. Its central volcanic peak has never been climbed by a car before, but they have made it too far to turn back now. Bill faces some of the sharpest and strangest rock driving of his life as he takes on lava walls, cinder cones and collapsed volcanic tunnels. As Ruby’s tyres shred, he creates ingenious tyre “gloves” to keep them rolling and protect Ruby. But there is no protection from the desert heat, which soars to almost 50 degrees Celsius. After spending the night in a unique “spatter bubble” cave, the guys attempt to scale an incredible volcanic peak inside a massive crater. It is one of Gary and Bill's biggest ever challenges.