Dark matter and dark energy make up roughly ninety-five percent of everything in the universe, yet neither has ever been directly observed. This film lays out how astronomers inferred their existence in the first place: galaxies spinning faster than visible matter can explain, and distant supernovae showing the universe's expansion accelerating rather than slowing. Physicists interviewed walk through the competing candidates for dark matter, from WIMPs to axions, and the cosmological constant proposed to account for dark energy's push. The back half turns to what these forces mean for the universe's ending, weighing scenarios researchers actually debate: a Big Crunch where gravity eventually wins and pulls everything back together, a Big Rip where dark energy tears matter apart at every scale, and a colder, slower heat death where the universe simply thins out into darkness. No single answer is settled, and the film treats that uncertainty as the actual state of the science rather than a problem to resolve.