What hope does astronaut Mark Watney (Matt Damon) have if he's considered dead and left behind on Mars by his colleagues? You have to make your own luck, and in that spirit, Watney assesses his leftover food supplies. There isn't enough, but the potatoes, tucked away by the crew for Thanksgiving, give him an idea. A botanist by training, Watney uses toilet waste, Martian soil, and water (derived from hydrogen previously oxidized by burning) to create a farm inside the base. Plastic sheeting covers the crops, and soon enough green shoots emerge from Watney's experiment. Creating produce has never been a feature of sci-fi films, but then, does The Martian really count as sci-fi? Either way, Damon is so absorbing that he charms your attention entirely. "In your face, Neil Armstrong."