Despite competition from box-office-crushing hobbits, X-Men, and Autobots, Christopher Nolan’s *Interstellar* landed as one of 2014’s big theatrical hits. But its ultimate legacy wasn’t clear at the time of that success: Would the tear-jerking story of a father crossing the expanse of space to save Earth and his children back home go down as a modern classic, or just another notch on Nolan’s blockbuster belt?