2-20: Return to Tomorrow
Several crew members are possessed by advanced non-corporeal beings.
2-26: Assignment: Earth
After traveling back to 1960s Earth, the Enterprise accidentally beams aboard a time-traveling secret agent.
2-25: Bread and Circuses
Upon investigating the disappearance of the S.S. Beagle crew, the Enterprise encounters a modernized Roman-like civilization.
2-03: The Changeling
Enterprise beams aboard a sophisticated device that poses a grave threat.