Astronomers and astrobiologists take on the panspermia question: could life on Earth have started somewhere else? The film opens at some of the world's most advanced observatories in Chile, where researchers scan the skies for clues about the early solar system, then moves to Spain's Rio Tinto region, where scientists study microbes thriving in acidic, metal-rich water that mimics conditions on Mars. Comet hunters explain how these icy bodies carry organic molecules and water across the solar system, and researchers lay out the case for meteorites as delivery vehicles, seeding young planets with the raw ingredients for life. Interviews with astrobiologists and planetary scientists weigh the evidence for Mars, comets, and even interstellar dust as possible origin points, while never claiming the case is closed. The film keeps its focus on process, how life's building blocks might travel through space and survive extreme environments, rather than settling on a single dramatic answer.