Scientists are on the verge of confirming the long-suspected presence of a supermassive black hole at the center of our galaxy – a powerful object capable of immense destruction. Will it suddenly become active and threaten our entire galactic region? NOVA explores the fascinating world of black hole research, revealing its most puzzling secrets. Using breathtaking computer simulations, including an unprecedented depiction of what it would be like to fall into a black hole, the film journeys from the event horizon to the singularity.