Pixar is taking us way back in time for The Good Dinosaur, which imagines a world in which dinosaurs never went extinct. Arlo, an Apatosaurus who seems very prone to stumbling, makes a new, significantly smaller, human friend. “A single moment can change history,” the trailer says. “A single kindness can change everything.” The world these two companions traverse seems both gorgeous (breathaking scenery) and dangerous (snakes with arms). The movie hits theaters on Nov. 25.