Star Trek: Voyager 4.11 - The Omega Directive/Unforgettable

The Omega Directive Voyager encounters Omega, the most powerful substance in the universe, with the ability to destroy all galactic warp travel if treated incorrectly.A standing Starfleet ordr means that Janeway must destroy the substance at all costs,but doing so means fighting off Omega's alie creators, and Seven of Nine who is determined to preserve it... Unforgettable An alien female of whom Chakotay has no memory attempts to convince him that only one month before, the couple were deeply in love. Reading that the woman belongs to a species who evade memory, Chakotay begns to fall for her once more. However, the relationship encounters difficulties when her memory, too, is erased.