**_The worst sci-fi flick ever made?_** A thousand years in the future, Earth has been taken over by a towering alien race called Psychlos, who have enslaved humanity with the intent of stripping the land of all resources. Other humans hide in the wilderness, living a primitive life. However, one “man-animal” (Barry Pepper) spurs a movement to free the planet. John Travolta and Forest Whitaker play chief-security Psychlos. Based on L. Ron Hubbard’s book from 1982, “Battlefield Earth” (2000) is post-apocalyptic sci-fi that mixes “Planet of the Apes” and “Logan’s Run” with a little…