Vampire Savior 2 Phobos/Huitzil Arcade

Long ago, Earth was visited by extraterrestrial beings, and these visitors created "them." Their purpose? To end all life on the planet's surface. 65,000,000 years ago, it was "they" who brought a sudden end to the age of the dinosaurs. Eventually, when most of the lifeforms on the planet's surface had been eradicated, the entire planet was shaken to the core by a largescale earthquake. Everything, living or otherwise, was trapped deep between the earth's layers.

Present day, at the Teotihuacan ruins in Mexico... A single unidentified form emerges from the ruins. The source of their commands had long ceased to exist, but the last command that had been inputted into the system had survived tens of millions of years and had reactivated "them" again.

"...Terminate All Lifeforms..."