Oblivion is based off a graphic novel of the same name written by Joseph Kosinki. It's a science fiction film that pays homage to Sci-Fi from the 70's. Co-written, produced and directed by Kosinki himself, the film throws you in to the aftermath of a war that left Earth all but lifeless. With the only humans seemingly left on Earth being the "mandatory memory wiped" Jack Harper(Tom Cruise), a drone technician and Victoria Olsen(Andrea Riseborough), Jacks controller, who form "the mop up crew".
Fighting off the remnants of the invading army and repairing the drones that defend huge water pumping platforms are how they spend their days. The platforms job being to turn Earth's salt water in to fusion material for humanities new colony on Titan, Jupiter's largest moon.
