A security guard is on patrol outside an embassy, but misses an intruder as he sneaks around outside with a flashlight.
He easily breaks in to the embassy through a window. Once inside, he knows exactly where to find the hidden safe, and takes out a paper with the combination and opens the safe. He is apparently unaware that he has tripped a security system within the safe, and moments later, four men in fancy dress arrive.
He pulls out a gun and fires on them, taking one down, but as he tries to make his way out, he is shot and falls to the ground. One of the men instructs another to get Dr. Serret. He goes through the intruder's wallet and sees from his license that he is Wesley J. Sanders.
Dr. Serret arrives and pronounces the man dead before going to check on the intruder. She determines that he has no pulse, but as he begins to move, she checks it again. She examines his chest and sees a hole where he was shot, but no blood. He tries to get up, but is held down while she uses her stethoscope to find a heartbeat. She removes it from her ears and asks, "Who are you? What are you?" The man next to her says he's a spy, and she says that may be, but he's also not a human being.
Starring Roy Thinnes as Architect David Vincent