The Ultrasaurus arrives in an area where there are a lot of islands and finds the one where the gravity cannon is ready to be installed onto it. Krueger is taken to Guygalos to recover and rest, and Rudolph arrives. Then everyone looks at the gravity cannon, and are surprised at how huge it is, but they have to equip it on the Ultrasaurus quickly or the enemy will find them. Meanwhile, Hiltz has arrived in the islands and sends lots of Sinkers to find the Ultrasaurus. At a meeting, Dr. D explains how the gravity cannon works. There are two parts to it, the actual gun and the power generators. The shell is made of a very dense material that has its own gravitational field, and will make a ""black hole"" when it hits its target. The only problem is that there are only three shells, and one must be used for a test shot. Karl is appointed to aim and fire the gravity cannon. Van, Thomas, and Irvine check on their zoids. The gravity cannon is linked to the Ultrasaurus.