- TV Show Ended -
There is no Next Episode of Star Trek planned.
The planet Merek II is gripped by a botanical plague. The only cure is the mineral zeenite, and the only practical source of that is Ardana. But Ardana has a stratified city: the troglytes who labor live in harsh conditions, while philosophers and artists enjoy the beauty of its floating city, Stratos. One among the troglytes, Vanna, means to change this, and plans to exploit the crisis - and Federation representatives Kirk and Spock - to accomplish that.
The Enterprise surveys the planet Excalbia. As its surface is the temperature of molten rock, no landing party is possible, so when the orbital survey concludes, Kirk orders the ship to leave. And then... Abraham Lincoln appears, and at the same time a region forms on the planet suitable for human life. Kirk and Spock beam down and discover Yarnek. It seems the Excalbians are struggling to understand the concepts of good and evil; the help themselves they have constructed an experiment: four examplars of good, including Kirk and Spock, will battle four exemplars of evil, notorious figures from history. And if good loses, the Enterprise will be destroyed...
While trying to locate the missing population of a planet doomed by a coming nova, Kirk, Spock, and McCoy find a mysterious librarian who sends them back into the planet's past. While Spock and McCoy fight for survival in a frigid landscape, Kirk is accused of witchcraft.
Janice Lester, a lover from Kirk's past, uses alien technology to switch her consciousness into his body and vice versa, so that she can take command of the Enterprise and become a Starfleet captain as she always wanted.