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The Butterfly Effect plot summary
The Butterfly Effect - timeline
Evan Treborn is born, or in one timeline, deliberately strangles himself in the womb.
Evan Treborn experiences blackouts.
Four kids, Evan, Kayleigh, Tommy and Lenny, go off the rails, or on the rails, depending on the timeline.
Evan Treborn, a student, loses Kayleigh in various ways in different timelines.