The Butterfly Effect [Official Trailer] (2004)

The Butterfly Effect is a 2004 American science fiction psychological thriller film that is written and directed by Eric Bress and J. Mackye Gruber and starring Ashton Kutcher and Amy Smart. The title refers to the butterfly effect, a popular, hypothetical example in chaos theory which illustrates how, in any dynamic system, small initial differences may, over time, lead to large unforeseen consequences.

==CAST==
* Ashton Kutcher as Evan Treborn
* Amy Smart as Kayleigh Miller
* Elden Henson as Lenny Kagan
* William Lee Scott as Tommy Miller
* Melora Walters as Andrea Treborn