Supermassive black holes anchor this film's tour of the universe's most violent objects, from Sagittarius A* at the center of the Milky Way to the far larger giant sitting inside the elliptical galaxy M87. The film explains how astronomers detect something that emits no light at all, using space telescopes tuned to x-rays and gamma rays and ground-based instruments that correct for atmospheric blur to catch the radiation thrown off as matter falls toward these objects. It traces the discovery that black holes can erupt with outbursts violent enough to reshape entire galaxies and scatter the elements that later form stars and planets. A key piece of evidence comes from the Hubble Deep Field, a 1995 project in which the telescope stared at a single patch of empty sky for days and returned images of small, irregular galaxies from the early universe, supporting the idea that galaxies built up gradually through mergers. Astrophysicists narrate the case, working from scale up to the largest black holes known and what they reveal about cosmic history.