Invaders from Mars

One evening, David McLean, a young boy fascinated by   astronomy, sees a flying saucer that comes to bury in a sandpit near his home. The following day his father George McLean, a scientist working on a space project, renders on supposed places of the landing. There he is gobbled by a fissure in the sandpit. Alerted by the disappearance of the scientist, two policemen inquire, and are also snatched by the sand that give way beneath them...