If you, as a 10-year-old boy, saw this when it was new and "cutting edge," it'll always have a special place in your heart. Admittedly, the first half is dated and burdened with corny humor, but once the trip to Mars commences, there's one semi-classic sequence after another: the near-collision with an asteroid, the funeral for the dead astronaut, Christmas on Mars, the Mars-quake etc. It'd be hard to write a history of the science-fiction film without a section devoted to this uneven but influential work.