Determinism is the philosophical belief that "all events, including human action, are ultimately determined by causes regarded as external to the will" and as such, free will does not exist. It is a central theme in Dark.
- Peter Doppler recites the serenity prayer: “God, grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom to know the difference.” Dark Season 1 Episode 1: "Secrets"
- Jonas travels back to 1986 to rescue Mikkel and change the circumstances of the future, but is prevented by his future self as it would eliminate his own existence.
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