Dark (2017)

A child vanishes in the German town of Winden, and the families searching for him slowly discover that their own parents and grandparents are tangled in the same loop. Baran bo Odar and Jantje Friese use time travel to ask whether anyone can choose differently, not for gadget thrills. Keep notes or a family tree handy, and watch in German with subtitles. Its three seasons finish the story properly, which is rarer than it should be.