Describing themselves as "Archaeologists of the Impossible", Planetary is an organization intent on discovering the world's secret history. The field team travels the world investigating strange phenomena - including monsters, aliens and superhumans, unusual relics and suppressed military secrets - for both the betterment of mankind and out of sheer curiosity. The group is sporadically opposed by a rival group of posthumans called the Four, a parallel Fantastic Four (Dr. Randall Dowling, Kim Süskind, William Leather and Jacob Greene) intent on using the secrets of the world for personal gain.