Scripts
THE BUTTERFLY EFFECT poster

Screenplay data

THE BUTTERFLY EFFECT script

Evan Treborn, a college student with blackouts, discovers he can alter his past by reading childhood journals, a power shared with his institutionalized father. After learning his childhood love, Kayleigh, committed suicide, Evan repeatedly travels back to prevent tragedies, inadvertently creating increasingly worse outcomes for his friends and family. Realizing his efforts only cause more harm, Evan makes the ultimate sacrifice by traveling back to his own birth and strangling himself in the womb, erasing his existence. In the final timeline, Evan is never born, and his friends and family live happy, untroubled lives, though Evan and Kayleigh briefly cross paths as strangers years later.

Writer
J. Mackye Gruber & Eric Bress
IMDb ID (imdb_id)
tt0289879
Script date
SHOOTING DRAFT
82Scenes
11Characters
78Pages
8Dialogue samples

Save the Cat beat sheet

THE BUTTERFLY EFFECT Save the Cat analysis

Evan, plagued by mysterious blackouts and armed with journals, discovers he can travel back in time to alter traumatic childhood events.

Open full beat sheet
60

Key characters

Evan Treborn

Evan Treborn is listed as Protagonist. Good-looking with dark haunted eyes; suffers from blackouts and memory loss. In the parsed data, Evan Treborn is connected to 81 scenes, 127 dialogue lines, 127 text mentions, first appearing around scene 1.

81 scenes / 127 dialogue lines

Kayleigh Miller

Kayleigh Miller is listed as Evan's childhood friend and love interest. Sweet-looking girl with beautiful hair; suffers from a troubled home life. In the parsed data, Kayleigh Miller is connected to 32 scenes, 33 dialogue lines, 33 text mentions, first appearing around scene 8.

32 scenes / 33 dialogue lines

Lenny Kagan

Lenny Kagan is listed as Evan's childhood friend. A chubby, sensitive kid who grows up to be Evan's loyal friend. In the parsed data, Lenny Kagan is connected to 25 scenes, 25 dialogue lines, 25 text mentions, first appearing around scene 7.

25 scenes / 25 dialogue lines

Tommy Miller

Tommy Miller is listed as Kayleigh's brother. A tough, aggressive kid who often bullies others. In the parsed data, Tommy Miller is connected to 24 scenes, 19 dialogue lines, 19 text mentions, first appearing around scene 6.

24 scenes / 19 dialogue lines

Andrea Treborn

Andrea Treborn is listed as Evan's Mother. A nurse who is deeply concerned about her son's condition. In the parsed data, Andrea Treborn is connected to 17 scenes, 20 dialogue lines, 20 text mentions, first appearing around scene 9.

17 scenes / 20 dialogue lines

Thumper

Thumper is listed as Evan's college roommate. A punked-out Gothic boy. In the parsed data, Thumper is connected to 9 scenes, 9 dialogue lines, 11 text mentions, first appearing around scene 24.

9 scenes / 9 dialogue lines

Dr. Harlon Redfield

Dr. Harlon Redfield is listed as Psychiatrist. Handsome and genial doctor treating Evan and his father. In the parsed data, Dr. Harlon Redfield is connected to 5 scenes, 19 dialogue lines, 19 text mentions, first appearing around scene 10.

5 scenes / 19 dialogue lines

George Miller

George Miller is listed as Kayleigh and Tommy's father. Handsome, athletic, but abusive and predatory. In the parsed data, George Miller is connected to 5 scenes, 5 dialogue lines, 5 text mentions, first appearing around scene 41.

5 scenes / 5 dialogue lines

Heidi

Heidi is listed as College student. Beautiful, wears ripped jeans. In the parsed data, Heidi is connected to 4 scenes, 6 dialogue lines, 6 text mentions, first appearing around scene 25.

4 scenes / 6 dialogue lines

Jason Treborn

Jason Treborn is listed as Evan's Father. Institutionalized, suffers from a mental condition similar to Evan's. In the parsed data, Jason Treborn is connected to 2 scenes, 5 dialogue lines, 5 text mentions, first appearing around scene 5.

2 scenes / 5 dialogue lines

Mrs. Boswell

Mrs. Boswell is listed as Teacher. Evan's elementary school teacher. In the parsed data, Mrs. Boswell is connected to 2 scenes, 3 dialogue lines, 3 text mentions, first appearing around scene 3.

2 scenes / 3 dialogue lines

Scene outline

  1. 1. INT. Doctor's Office - NIGHT

    Evan hides in a doctor's office, injured and writing in a journal, hoping to change the past.

    Evan Treborn
  2. 2. EXT. Andrea's House - EARLY MORNING

    Andrea and Evan prepare for school while discussing Evan's father.

    Evan Treborn, Andrea Treborn
  3. 3. INT. Elementary School Classroom - DAY

    Mrs. Boswell shows Andrea a disturbing drawing made by Evan.

    Evan Treborn, Andrea Treborn, Lenny Kagan, Kayleigh Miller, Tommy Miller, Mrs. Boswell
  4. 4. INT. Miller's House Basement - DAY

    Evan experiences a blackout while at the Miller house.

    Evan Treborn, Kayleigh Miller, Tommy Miller, George Miller
  5. 5. INT. Sunnyvale Visitor's Chamber - DAY

    Evan visits his father, Jason, which ends in a violent outburst.

    Evan Treborn, Andrea Treborn, Jason Treborn, Dr. Harlon Redfield
  6. 6. INT. Miller's House Basement - DAY

    The group of friends, now thirteen, plan to blow something up.

    Evan Treborn, Lenny Kagan, Kayleigh Miller, Tommy Miller
  7. 7. EXT. MRS. HALPERN'S HOME - CONTINUOUS

    Lenny plants a bomb in a mailbox while the others watch from the woods.

    Lenny Kagan, Tommy Miller, Kayleigh Miller, Evan Treborn
  8. 8. EXT. HALPERNS' FOREST - DAY

    Evan experiences a blackout and finds himself in the woods with a dazed Lenny.

    Evan Treborn, Tommy Miller, Kayleigh Miller, Lenny Kagan
  9. 9. EXT. LENNY'S HOUSE - DRIVEWAY - DAY

    Lenny is taken by ambulance while Andrea questions the kids.

    Andrea Treborn, Evan Treborn, Tommy Miller
  10. 10. INT. DR. REDFIELD'S OFFICE - DAY

    Dr. Redfield hypnotizes Evan to recover memories of the incident.

    Dr. Harlon Redfield, Evan Treborn, Andrea Treborn
  11. 11. EXT. MULTIPLEX THEATER - PARKING LOT - DUSK

    Tommy threatens Evan to keep quiet about the mailbox incident.

    Andrea Treborn, Evan Treborn, Kayleigh Miller, Tommy Miller
  12. 12. INT. MULTIPLEX THEATER LOBBY - DUSK

    Evan checks on Kayleigh.

    Evan Treborn, Kayleigh Miller, Tommy Miller
  13. 13. INT. ANDREA'S HOUSE - KITCHEN - NIGHT

    Andrea watches a news report about the vandalism.

    Andrea Treborn
  14. 14. INT. MULTIPLEX THEATER - NIGHT

    Tommy causes a scene, and Kayleigh and Evan leave.

    Tommy Miller, Kayleigh Miller, Evan Treborn
  15. 15. INT. LOBBY - CONTINUOUS

    Evan and Kayleigh share a moment, and Tommy attacks a teen.

    Evan Treborn, Kayleigh Miller, Tommy Miller
  16. 16. INT. ANDREA'S CAR - NIGHT

    Andrea drives the kids home and hints that she knows about the incident.

    Andrea Treborn, Evan Treborn, Kayleigh Miller
  17. 17. EXT. ANDREA'S HOUSE - MORNING

    Andrea leaves for work, and Evan watches her.

    Andrea Treborn, Evan Treborn
  18. 18. EXT. LENNY'S HOUSE - DAY

    Evan and Kayleigh visit Lenny.

    Evan Treborn, Kayleigh Miller, Lenny Kagan
  19. 19. EXT. JUNKYARD WOODS - DAY

    The group sees smoke and finds Tommy at a campfire.

    Evan Treborn, Lenny Kagan, Kayleigh Miller, Tommy Miller
  20. 20. EXT. JUNKYARD - DAY

    Evan wakes up after another blackout.

    Evan Treborn, Lenny Kagan, Kayleigh Miller
  21. 21. EXT. LENNY'S HOUSE - DAY

    Lenny is taken away, and Mrs. Kagan calls Evan a monster.

    Lenny Kagan, Evan Treborn
  22. 22. EXT. ANDREA'S HOUSE - DAY

    Evan and Andrea move away.

    Andrea Treborn, Evan Treborn, Kayleigh Miller
  23. 23. INT. COLLEGE CLASSROOM - DAY

    Seven years later, Evan is a college student.

    Evan Treborn
  24. 24. INT. EVAN'S DORM - DAY

    Evan interacts with his roommate Thumper.

    Evan Treborn, Thumper
  25. 25. INT. DIRTY HANK'S BAR - DAY

    Evan and Thumper play pool and meet Heidi.

    Evan Treborn, Thumper, Heidi
  26. 26. INT. EVAN'S DORM - NIGHT

    Evan and Heidi return to the dorm, drink, and Evan begins reading his journals, triggering a memory flashback.

    Evan Treborn, Kayleigh Miller, Heidi
  27. 27. EXT. JUNKYARD - DAY - 1995

    Flashback to the traumatic junkyard incident where Evan tries to save Crockett.

    Evan Treborn, Lenny Kagan, Kayleigh Miller, Tommy Miller
  28. 28. INT. EVAN'S DORM - NIGHT - 2002

    Evan wakes up from the flashback, Heidi leaves, and Evan decides to visit Lenny.

    Evan Treborn, Heidi
  29. 29. INT. EVAN'S CAR - SUNRISE

    Evan drives to Lenny's house.

    Evan Treborn
  30. 30. INT. LENNY'S ROOM - DAY

    Evan visits Lenny to ask about the junkyard incident.

    Evan Treborn, Lenny Kagan
  31. 31. INT. EVAN'S DORM - NIGHT

    Evan reviews his journals and triggers another flashback.

    Evan Treborn, Thumper
  32. 32. EXT. MRS. HALPERN'S HOME - DAY - 1995

    Flashback to the mailbox explosion.

    Evan Treborn, Lenny Kagan, Kayleigh Miller, Tommy Miller
  33. 33. INT. EVAN'S DORM - NIGHT

    Evan wakes up with a new scar.

    Evan Treborn, Thumper
  34. 34. INT. DORM LOBBY - DAY

    Evan talks to Professor Carter.

    Evan Treborn
  35. 35. INT. FANCY RESTAURANT - NIGHT

    Evan asks his mother about his father's memory tricks.

    Evan Treborn, Andrea Treborn
  36. 36. INT. EVAN'S DORM - NIGHT

    Thumper confronts Evan about his journals.

    Evan Treborn, Thumper
  37. 37. EXT. RIDGEWOOD DINER - EVENING

    Evan visits Kayleigh at the diner.

    Evan Treborn, Kayleigh Miller
  38. 38. INT. EVAN'S DORM - NIGHT

    Evan learns of Kayleigh's suicide.

    Evan Treborn, Thumper
  39. 39. EXT. CEMETERY - DAY

    Evan visits Kayleigh's grave.

    Evan Treborn
  40. 40. INT. EVAN'S DORM - NIGHT

    Evan prepares to travel back in time again.

    Evan Treborn
  41. 41. INT. Miller's House - Living Room - DAY - 1989

    Mr. Miller directs Evan and the kids to prepare for a movie shoot.

    Evan Treborn, Tommy Miller, Kayleigh Miller, George Miller
  42. 42. INT. Miller's Basement - DAY - 1989

    Mr. Miller attempts to force Evan and Kayleigh into a compromising situation for his film.

    Evan Treborn, Kayleigh Miller, Tommy Miller, George Miller
  43. 43. INT. Sorority Bedroom - MORNING - 2002

    Evan wakes up in a new reality where Kayleigh is alive and they are a couple.

    Evan Treborn, Kayleigh Miller
  44. 44. INT. Sorority Bathroom - MORNING

    Evan encounters Gwen while cleaning up.

    Evan Treborn, Heidi
  45. 45. EXT. College Quad - DAY - 2002

    Evan and Kayleigh walk through campus; Evan asks about the camera.

    Evan Treborn, Kayleigh Miller
  46. 46. INT. Dorm Lobby - DAY

    Evan calls home and encounters Thumper.

    Evan Treborn, Thumper
  47. 47. INT. College Classroom - DAY

    Evan takes an exam and interacts with Hunter.

    Evan Treborn
  48. 48. EXT. Frat House - Roof - NIGHT

    Evan surprises Kayleigh with a romantic dinner.

    Evan Treborn, Kayleigh Miller
  49. 49. EXT. Frat House - Parking Lot - CONTINUOUS

    Evan discovers his car has been vandalized.

    Evan Treborn, Kayleigh Miller
  50. 50. EXT. College Quad - NIGHT

    Tommy attacks Evan; Evan fights back and kills Tommy.

    Evan Treborn, Kayleigh Miller, Tommy Miller
  51. 51. INT. Mavis Penitentiary - DAY

    Evan arrives at prison.

    Evan Treborn
  52. 52. INT. Mavis Visiting Chamber - DAY

    Andrea visits Evan in prison.

    Evan Treborn, Andrea Treborn
  53. 53. INT. MAVIS PENITENTIARY - DAY

    Evan walks through a corridor, is harassed by Neo-Nazis, and loses his journals in a scuffle.

    Evan Treborn, Lenny Kagan, Tommy Miller
  54. 54. INT. EVAN'S CELL - DAY

    Evan tapes a journal page to his wall.

    Evan Treborn, Lenny Kagan
  55. 55. INT. PRISON CORRIDOR - DAY

    Karl mocks Evan by reading his journal aloud.

    Evan Treborn
  56. 56. EXT. PRISON YARD - DAY

    Evan tries to convince Carlos that he is sent by God.

    Evan Treborn, Lenny Kagan
  57. 57. INT. EVAN'S CELL - LATER

    Evan experiences a memory shift while reading his journal.

    Evan Treborn, Lenny Kagan
  58. 58. INT. FIRST GRADE CLASSROOM - DAY

    Young Evan is in school and attempts to change the past.

    Evan Treborn, Mrs. Boswell
  59. 59. INT. EVAN'S PRISON CELL - DAY

    Evan returns to the present with stigmata on his hands.

    Evan Treborn, Lenny Kagan
  60. 60. INT. KARL'S CELL - CONTINUOUS

    Evan confronts the Aryans and Carlos intervenes.

    Evan Treborn, Lenny Kagan
  61. 61. EXT. JUNKYARD WOODS - DAY

    Evan returns to 1995 to change the outcome of the junkyard incident.

    Evan Treborn, Lenny Kagan, Kayleigh Miller, Tommy Miller
  62. 62. INT. EVAN'S DORM - DAY

    Evan returns to 2002 and suffers a medical episode.

    Evan Treborn, Thumper
  63. 63. INT. DR. REDFIELD'S OFFICE - DAY

    Evan and Andrea discuss his brain scans with Dr. Redfield.

    Evan Treborn, Andrea Treborn, Dr. Harlon Redfield
  64. 64. INT. SUNNYVALE - LENNY'S ROOM - CONTINUOUS

    Evan visits Lenny in the institution.

    Evan Treborn, Lenny Kagan
  65. 65. INT. SUNNYVALE VISITOR'S CHAMBER - DAY

    Evan visits his father in 1989.

    Evan Treborn, Jason Treborn
  66. 66. EXT. MILLER HOUSE - EVENING

    Evan confronts Mr. Miller.

    Evan Treborn, George Miller
  67. 67. INT. KAYLEIGH'S SEEDY HOTEL ROOM - CONTINUOUS

    Evan visits Kayleigh, who is now a drug addict.

    Evan Treborn, Kayleigh Miller
  68. 68. INT. DINER - NIGHT

    Evan and Kayleigh discuss his past and his ability to change time, while Kayleigh remains skeptical.

    Evan Treborn, Kayleigh Miller
  69. 69. INT. EVAN'S DORM - DAY

    Evan finds his journals and prepares to travel back in time to save Mrs. Halpern.

    Evan Treborn, Thumper
  70. 70. EXT. MRS. HALPERN'S HOUSE - DAY - 1995

    Evan travels back to 1995 to prevent the mailbox explosion.

    Evan Treborn, Lenny Kagan, Tommy Miller
  71. 71. INT. EVAN'S DORM - DAY - 2002

    Evan returns to 2002 to find he has no arms.

    Evan Treborn, Lenny Kagan, Kayleigh Miller
  72. 72. INT. HANDICAPPED BATHROOM - DAY

    Evan attempts suicide but is interrupted by Tommy.

    Evan Treborn, Tommy Miller
  73. 73. INT. ST. VINCENT'S HOSPITAL - EVENING

    Evan visits his mother, who is dying of lung cancer.

    Evan Treborn, Andrea Treborn, Tommy Miller
  74. 74. INT. EVAN'S DORM - NIGHT

    Evan prepares to travel back to 1989 to destroy the blockbuster.

    Evan Treborn, Lenny Kagan
  75. 75. INT. ANDREA'S HOUSE - KITCHEN - MORNING - 1989

    Evan travels back to 1989 as a child.

    Evan Treborn, Andrea Treborn
  76. 76. INT. MILLER'S BASEMENT - DAY - 1989

    Evan attempts to destroy the blockbuster to prevent future tragedies.

    Evan Treborn, Kayleigh Miller, Tommy Miller, George Miller
  77. 77. INT. SUNNYVALE - DAY - 2002

    Evan is institutionalized and told his journals never existed.

    Evan Treborn, Dr. Harlon Redfield
  78. 78. INT. DR. REDFIELD'S OFFICE - NIGHT

    Evan breaks into Dr. Redfield's office to find his medical file and uses a film projector to trigger a memory jump.

    Evan Treborn, Andrea Treborn, Dr. Harlon Redfield
  79. 79. EXT. LENNY'S BACKYARD - DAY - 1987

    Evan travels back to his childhood birthday party and tells young Kayleigh to stay away from him.

    Evan Treborn, Andrea Treborn, Kayleigh Miller
  80. 80. INT. EVAN'S DORM - DAY - 2002

    Evan wakes up in his dorm room after the memory jump, feeling hopeful.

    Evan Treborn, Lenny Kagan

Dialogue examples

I'll do whatever you want. You don't want me to ever see Kayleigh again, fine. Just let Crockett go. Besides, you kill him now and they'll stick you in juvy for sure. And I know you'd never leave your sister alone with your father.

Evan Treborn / Scene 61

It kills me to have to go through this again. There are no journals. There never were. It's part of this fantasy world your mind created to cope with the guilt of killing...

Dr. Harlon Redfield / Scene 77

Today I found my grandfather's death certificate. He died in a nut house, just like my father. Mom denies it, but she thinks I'm gonna end up the same way...

Lenny Kagan / Scene 55

Don't ever bring that shit up again. Not ever. Not to me, not to Kayleigh, or even Lenny. The stupid fuck if he ever learns to talk again. Understand?

Tommy Miller / Scene 11

...was the grizzly aftermath of what police officials of upstate New York are calling a horrible act of vandalism gone awry.

Andrea Treborn / Scene 13

You wouldn't believe me. I mean, people always say, "You wouldn't believe me", but in this case, it's not even worth trying.

Evan Treborn / Scene 67

You chop up the smart flatworm and feed it to the dumb one and presto, the dumb one suddenly knows the maze inside and out.

Evan Treborn / Scene 25

I want you to take this, Lenny. Today's your day of atonement. I know how guilty you feel about that woman and her baby --

Evan Treborn / Scene 61

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