Mouth of the Beast is the ninth mission of the Campaign. It starts on June 25th 1937 when Rex and Lucy flies past Isla Perculsus and is attacked by three eel-whales. The Lab crashes on the island. The player will have to build up their defences quickly as they will be swarmed by enemy units trying to destroy the lab. After protecting it for about 10 minuttes the Lab will be fully repared and the team will relocate to the north-west corner, all the other buildings will still be usable.