The R. U. Sirius is a space station orbiting planet Earth. Disguised as a research station, its secret purpose is to intercept aliens before they reach Earth, thus preventing average people from finding out about the existence of extraterrestrial life. It also sometimes has do deal with non-alien menaces like Mole People or even Zombies. The station was founded by the mysterious government agent known as Agent X. It mostly acts as an embassy to interact with alien species of all kinds; to welcome the friendly races and battle against hostile ones.