This documentary revisits the 1986 Chernobyl nuclear disaster and its far-reaching consequences through the eyes of scientist Dr. Allen Dobrovolsky, who investigated the fallout shortly after the explosion and returns decades later to uncover its lasting dangers. He reveals widespread radiation contamination threatening millions through polluted water sources and buried toxic ruins. The film also connects Chernobyl to the 2022 Russian invasion of Ukraine, when the plant was seized, staff were abducted, and Russian troops exposed themselves to deadly radiation. It portrays Chernobyl as an ongoing environmental and geopolitical time bomb.