This episode has always been one of my favorites. Written long after "The Time Machine" and long before "Back To the Future", it tackles the question of whether or not a time traveler could alter history. It only scratches the surface for so many possibilities, but within the confines of a 20 minute episode it does very well. I really like the performance by John Lasell as Wellington/Booth, even though he was probably chosen more for his looks than anything. The ending also works well, even though the "shock" is not nearly as severe as many of the more famous episodes.