During a scientific experiment, Nikola Tesla accidentally opens a window into a dimension populated by terrible ancestral beings. Without evidence sufficient to convince anyone else, he begins quietly preparing Earth's defenses against a future invasion he has found prophesied in esoteric sources. As part of that preparation, he sends his pupil William Bolt to train for war, equipping him with weapons developed specifically to fight extra-dimensional creatures. When the invasion arrives, William and the arsenal Tesla built for him are the world's only prepared response.