An alien invasion is one thing, but in this 1960s series the extraterrestrials are already among us! When architect David Vincent (Roy Thinnes) returns home from a business trip in the predawn hours, he spots the landing of a spacecraft containing visitors from another planet. Vincent learns that these beings are able to disguise themselves as humans. Now he must bring this unpleasant knowledge to the rest of humankind. And it will not be easy... This collection presents the first season of the sci-fi series.