Teenage Space Vampires (Darkness Comes) (1999)

Bill, a high school student and avid horror movie fan, witnesses a UFO flying over his town. When the ship lands the next day, Bill and a team from SETI discover that the alien is a strange vampire creature who wants to cast the Earth into darkness so that he and his people can colonize it for themselves. Will Bill and the others be able to keep the Sun shining?