Zor Kahn was a planetary leader of the planet Sarpeidon and was known as "Zor Kahn the Tyrant". He was also known for having an inventive mind. Zor Kahn banished Zarabeth into a barren ice age five thousand years in her planet's past after two of her family members conspired to kill him. In 2269, information about Zor Kahn was stored in history tapes on file at the library which was then under the care of Mr. Atoz. Spock briefly viewed a history tape mentioning Zor Kahn before discussing with Mr. Atoz the workings of the Atavachron. (TOS: "All Our Yesterdays" )