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Otherworldly invaders devise a fiendish new weapon in their bid to conquer the Earth -- attractive women who want to have sex -- in this erotic sci-fi drama for adults. Forrest (Kira Reed) and Preston (Mark Collver) are a pair of FBI agents who investigate paranormal phenomena. Forrest and Preston are assigned to look into the strange case of a group of astronauts who are exhibiting strange behavior after returning from a mission in outer space. The men are quite ill, and the lone woman (Gabriella Hall) is in a state of constant sexual excitement. As it turns out, the lone female astronaut was infected with an alien life form which causes its victims to spawn clones that will do the bidding of the alien leaders. Of course, the alien life force is most easily spread through lovemaking, so the female astronaut soon begins making all sorts of new friends. The Alien Files was originally produced under the title The Sex Files.