Investigation of a faux comet accidentally releases an suicidal Q philosopher (later called Quinn), whom the Continuum imprisoned over 300 years ago to prevent his death and unbalance their society. When Q appears to put him back, Quinn demands asylum. A chase ensues with Voyager in tow, which Captain Janeway ends by calling for a hearing to decide whether to return Quinn to his confinement and live or to grant his request for mortality and risk him ending his own life.
—statmanjeff