In 1949, a weary Indiana Jones wants only to retire and marry linguist Elaine McGregor. But when his fiancée is kidnapped from the altar by her mysterious ex-husband, Indy discovers Elaine secretly works for Army intelligence on a crashed alien spacecraft in the New Mexico desert. A desperate race against time unfolds as Russian spies led by the charming Vadim Cheslav and a traitorous scientist steal the crashed craft’s power source—an ancient stone cylinder covered in indecipherable glyphs. With the cylinder counting down toward catastrophe, Indy, Elaine, and an enemy-turned-ally pursue the Russians across the atomic-age southwest. From a harrowing ride on a rocket sled to a desperate last stand atop a sacred mountain, Indy must return the device before it triggers an apocalypse—while trying to salvage his wedding day.