The Island Fortress was Mesogog's base of operation. It was destroyed by Hayley using the Triceramax Command Center Truck in the Dino Thunder Finale. Mesogog's Fortress was set on a mountainous island out at sea. The island was originally home to Anton Mercer's lab, but the entire island was destroyed after a failed experiment, and sunk beneath the sea. Mesogog brought it back to serve as his headquarters. Most of the Fortress' walls were painted black or another dark color, as were the floors and ceilings. The lights were mainly yellow, and were set into the walls and the ceiling.