"The Hundred Days of the Dragon" isn't a bad TV episode, though it seems to have nothing to do with the series. There were a few shows that just seemed totally out of place--and it was definitely true of this one. What does espionage have to do with sci-fi or fantasy?! The show begins in a fictional Asian communist country. Their despot leader is being shown a new weapon. This weapon involves a new formula that briefly makes the flesh malleable--so a similar looking person could be made to look exactly like another. Their plan involves substituting one of their agents for a man who appears posed to win the presidency in the United States. It's an interesting plot--and a bit reminiscent of "The Manchurian Candidate".
If you've seen more than a few episodes of the show, you should recognize that the above plot just isn't "The Outer Limits". It's interesting and reasonably well-acted but it's obvious the producers were still uncertain WHAT the series would become.