If current server doesn't work please try other servers below.
Season 1 - Sep. 08, 1966
Season 2 - Sep. 15, 1967
Season 3 - Sep. 20, 1968
Star Trek Season 1 Episode 18
HD
Overview:
When a mysterious alien race destroy an Earth colony, the Enterprise pursues but Kirk and the alien captain are forced to fight each other by powerful aliens.