Several crewmembers experience post-traumatic stress from unexplained memories of an unknown conflict.
6-04: Tinker, Tenor, Doctor, Spy
The Doctor's experiment with daydreaming leads Voyager into a potential ambush.
6-01: Equinox, Part II
Under attack by interdimensional aliens, Voyager hunts down the U.S.S. Equinox to stop its decadent crew.