Yellowjackets deliberately refuses to answer its biggest question: Is there something supernatural in those woods, or is everything psychological? Both interpretations remain valid through three seasons.
The Evidence
For Supernatural: Lottie's accurate visions, Taissa's "Other" self, impossible coincidences, the symbols For Psychological: Group trauma, Lottie's mental health history, confirmation bias, no definitive supernatural event
The showrunners have stated the ambiguity is intentional. The truth may never be revealed—and that's the point.
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