By imagining a plausible world in which World War II is avoided when an American populist president cozies up to Hitler, The Plot Against America becomes an effective allegory for all the ways well-meaning citizens gradually allow fascists to take power. Every perspective espoused by the Levins—a Jewish family grappling with the new president’s endorsement of anti-Semitism—is treated as just one partially correct response that’s ultimately just too little, too late. These ideological discussions that make up the heart of the miniseries are nevertheless filmed on a grand scale, and played with real fervor by an ensemble cast that includes Morgan Spector, Zoe Kazan, Winona Ryder, and John Turturro.