2-23: The Omega Glory
The Exeter is found drifting in space, its crew dead from a mysterious disease, except its missing captain.
2-26: Assignment: Earth
After traveling back to 1960s Earth, the Enterprise accidentally beams aboard a time-traveling secret agent.
2-01: Amok Time
When Spock exhibits irrational behavior from pon farr, The Enterprise heads to Vulcan for help.