A proper movie marathon deserves films that build on each other — each one raising the stakes a little, keeping the session alive well past the point you planned to stop. The documentary revelations that genuinely shock aren't manufactured — they're discoveries the filmmakers made in the process of making the film, and you feel that.
The next time you are planning a night for a movie marathon and need a documentary movie that actually delivers, start here. This list is updated regularly so the recommendations stay fresh. And if you find a favourite, check out its dedicated page for more details, cast info, and similar films you might love.