This episode explores the notion of killing evil before it has a chance to grow into a menace for mankind--sort of like if you could go back through time to kill Hitler. The show begins with an astronaut from 1961 landing in the future only to find that the planet has been decimated and what people are left are hideous creatures. One named Andro explains that all this was caused by a scientist who accidentally created a plague and wiped out most everyone on the planet. So, using the ship, Andro returns to the 1960s to kill the man who would one day destroy mankind. However, because he's so ugly, he's able to use cool psychic powers to make others think he looks just like Martin Landau! And, it turns out, he's arrived just in time to possibly prevent the scientist's parents from ever marrying! Overall, a very intriguing episode that only has one fault--the ending and the bride's reaction to Andro is just too weird and hard to believe. Still, it's a cool episode and one well worth your time. As usual for this series, it's well written and insightful. See this one.