If aliens disclose tomorrow, is it 'Arrival''s calm contact, 'Don't Look Up''s denial, or 'Independence Day''s invasion? We break down the real scenarios fans are debating.

Don’t expect a straightforward timeline, because continuity is a mess with the Alien and Predator timelines (even if, as in this list, you choose to ignore tie-in comics, novels, and games). Predator: ...