Segnali dallo spazio

The Museum of Worlds sent a mission into the tropical forest. Normal administration: it's just a matter of collecting some video material. Pure and simple routine. Yet, someone threatens the members of the expedition, so much so that they are forced to ask for help from the Alfa Agency. Meanwhile, mysterious "circles" suddenly appear on the forest floor and all communications suddenly cease, leaving the expedition members cut off from the rest of the world...