Genuinely clever sci-fi buried under about seven layers of fans explaining why it's genuinely clever sci-fi.
Fun fact: The show originated as a crude, unlicensed Back to the Future parody short called "Doc and Mharti."
They send eight blokes to find one bloke and nobody seems bothered by the maths.
Fun fact: After release, the Department of Veterans Affairs set up a PTSD hotline for veterans triggered by the film.