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As Germany's first Netflix original, it weaves a science-fiction mystery across four interconnected timelines spanning 1953 to 2053, involving 30+ characters with family ties that defy linear time. The show demands careful attention, rewarding viewers with revelations that explain its central paradox: time is a loop, not a line. Its complex narrative, built around the Kahnwald, Doppler, and Nielsen families, creates a dense puzzle that requires rewatches to fully grasp. A 2020 study found it has the highest density of named characters per episode in Netflix's sci-fi catalog.