Trailers From Hell : Five Million Years To Earth / Quatermass and the Pit

Third of Nigel Kneale's visionary Quatermass features adapted from his groundbreaking BBC serials, this one dispenses with Hammer's '50s reliance on transplanted US stars and took a decade to make it into production. Although somewhat cribbed from ideas in Arthur C Clarke's "Childhood's End", it's still one of the most challenging and intelligent sci-fi movies ever. This is the original British trailer.