In the first episode of "Alienigenas do Passado," mysterious beings from the cosmos descend upon Earth, their intentions unknown. These extraterrestrial explorers, with their otherworldly appearances and advanced technology, quickly set their sights on human intimacy. They observe humans from afar, intrigued by our carnal desires. As they delve deeper into our world, they begin to participate, their alien forms merging with human bodies in a dance of cosmic proportions. The result? An interstellar orgy that transcends time and space.