Kirk, Spock, Abraham Lincoln and Surak are pitted in battle against four notorious villains from history.
Sisko and Jake build a solar sailing ship in an attempt to recreate a journey taken by the ancient Bajorans. Meanwhile, Bashir encounters a former school rival.
The Doctor decides he should create a holographic family in order to expand himself. When B'Elanna is disgusted by its unrealistic perfectionism, she alters the program to include random events and outcomes with interesting and devastating results.
The crew is shattered by the apparent death of Data in a shuttle explosion, and they're prevented from carrying out a detailed investigation when Starfleet gives them orders for a new mission.
Kirk and Spock are forced into a battle of good and evil.
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