In the parallel universe,Nazi Germanyand theEmpire of Japanhave divided theUnited Statesinto the Greater Nazi Reich in the east, withNew York Cityas its regional capital, and the Japanese Pacific States to the west, withSan Franciscoas the capital. These territories are separated by a neutral zone that encompasses theRocky Mountains. The series starts in 1962 and follows characters whose destinies intertwine when they come into contact with newsreels and home movies that show Germany and Japan losing the war. The title of the series refers to the mysterious figure believed to have created the footage.
The pilot premiered in January 2015, and Amazon ordered a ten-episode season the following month which was released in November. A second season of ten episodes premiered in December 2016, and a third season was released on October 5, 2018. The fourth and final season premiered on November 15, 2019.