Unforgettable
Series: Star Trek: Voyager
Airdate: April 23, 1998 | Year Set: 2374
Season 4, Episode 22
Summary
A beautiful alien fleeing danger asks for Chakotay's help, claiming they knew each other in the past. She requests asylum aboard Voyager, saying she was on the ship a month ago and fell in love with Chakotay. But neither he nor any of the crew remembers her anymore.