In this speculative "Nova" documentary, astronomers suggest that, in our very midst, there may lurk a boogeyman of cosmological proportions: a supermassive black hole, which one day will swallow up every object in the Milky Way galaxy. What evidence is there to support this apocalyptic claim? Riveting interviews and stunning computer animation elucidate the awe-inspiring mystery of black holes. 56 min. Soundtracks: English, DVS.