As architect David Vincent is returning home from a business trip in the wee hours one Sunday morning, he attempts to find a shortcut in unfamiliar territory. While he doesn't find the route he is looking for, he does witness is something which goes apparently unnoticed by anyone else on Earth: the landing of a spacecraft containing creatures from a far-off 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 is the pilot for the TV series.