The 17-minute film, silent and in muzzy black and white, has enough implicit melodrama to fill a satisfying sci-fi epic. But some people believe, or hope, that it may be genuine--evidence of an alien life form on earth, conceivably connected with the report (and alleged government cover-up) of a UFO crash near Roswell, New Mexico, in 1947. Professional skeptics find the film a clever or clumsy hoax. Others believe it's real, but not from Roswell. The UFOlogical combatants duel it out in magazines and on the Internet while poring over the footage with an intensity not lavished on any home movie since the Zapruder film.