2-05: The Apple
In paradise-like surroundings, a landing party encounters a primitive race controlled by Vaal - a machine revered as a God.
2-17: A Piece of the Action
Enterprise discovers a gangster-run planet similar to 1930s Earth.
2-01: Amok Time
When Spock exhibits irrational behavior from pon farr, The Enterprise heads to Vulcan for help.
2-03: The Changeling
Enterprise beams aboard a sophisticated device that poses a grave threat.