Scientists, military strategists, and science fiction writers sit down to answer a single question: if extraterrestrials actually invaded Earth, what would it look like? The film builds its scenario from real physics and known technology limits rather than movie logic, working through how an advanced civilization might cross interstellar distances, what weapons or tactics it might use, and how human governments and armies could realistically respond. Interviewees weigh in on communication barriers, the odds of hostile versus peaceful contact, and the sheer difficulty of surviving a trip across space, using that groundwork to test familiar invasion tropes from film and television against what physics and military strategy actually allow. Archival clips and reenactment-style visuals illustrate the scenarios being discussed, while the experts keep circling back to plausibility rather than spectacle. The tone stays speculative but grounded, treating the invasion premise as a thought experiment for examining real science, weapons technology, and the limits of human preparedness against an unknown adversary.