2-06: The Doomsday Machine
Dispatched to investigate the destruction of several planets, the Enterprise encounters the badly damaged U.S.S. Constellation.
2-23: The Omega Glory
The Exeter is found drifting in space, its crew dead from a mysterious disease, except its missing captain.
2-04: Mirror, Mirror
A transporter accident swaps Kirk, McCoy, Scotty, and Uhura from distinctly opposite parallel universes.
2-25: Bread and Circuses
Upon investigating the disappearance of the S.S. Beagle crew, the Enterprise encounters a modernized Roman-like civilization.