The Butterfly Effect movies are about an individual who travels through time, and then has to deal with unexpected consequences. The title refers to the butterfly effect, a popular hypothetical example of chaos theory which illustrates how small initial differences may lead to large unforeseen consequences over time.
A young man struggles to access sublimated childhood memories. He finds a technique that allows him to travel back into the past, to occupy his childhood body and change history. However, he soon finds that every change he makes has unexpected consequences.
After his girlfriend, Julie, and two best friends are killed in a tragic auto accident, Nick struggles to cope with his loss and grief. Suffering from migraine-like seizures, Nick soon discovers that he has the power to change the past via his memories. However, his time-traveling attempts to alter the past and save his one true love have unexpected and dire consequences.
The story revolves around a man trying to uncover the mysterious death of his girlfriend and save an innocent man from the death chamber in the process, by using his unique power to time travel. However in attempting to do this, he also frees a spiteful serial-killer.
