In the original “Star Wars,” the Empire’s Death Star is a force to be reckoned with. Generating a death ray capable of vaporizing an entire planet, the space station seems indestructible—except, that is, for a troublesome thermal exhaust duct. It appears even Death Stars have some need for ventilation. The exhaust duct runs from something thermonuclear deep inside the superweapon, although we do not get to know what, exactly, it is exhausting. Perhaps excess neutrons? Stray Higgs bosons? A photon torpedo into the duct from Luke Skywalker (Mark Hamill) is the only chance to save, well, everything. Will he succeed? If you do not know the answer to that, you must have grown up on the planet Xenon.