Star Trek: Voyager - Season 2 Episode 18 -

While Voyager investigates what appears to be a rogue comet, the crew accidentally releases a member of the Q Continuum who has been imprisoned within it for over 300 years to prevent him from committing suicide. He then requests asylum on the ship, which leaves Captain Janeway to decide whether he should go back into confinement or whether to grant his request for asylum, which would give him the opportunity to end his life.