| Tom Welling | ... | Clark Kent | |
| Michael Rosenbaum | ... | Lex Luthor | |
| Kristin Kreuk | ... | Lana Lang (credit only) | |
| Allison Mack | ... | Chloe Sullivan | |
| Erica Durance | ... | Lois Lane | |
| Aaron Ashmore | ... | Jimmy Olsen | |
| Laura Vandervoort | ... | Kara | |
| John Glover | ... | Lionel Luthor (credit only) | |
| James Marsters | ... | Milton Fine | |
| Brett Dier | ... | Clark Kent | |
| Terence Stamp | ... | Jor-El (voice) | |
| Camille Mitchell | ... | Nancy Adams |
| Episode Crew |
Directed by | |||
| Tom Welling | |||
Writing credits(in alphabetical order) | ||
| Alfred Gough | creator | |
| Turi Meyer | writer | |
| Miles Millar | creator | |
| Al Septien | writer | |
Produced by | |||
| Tom Flores | .... | co-producer | |
| Alfred Gough | .... | executive producer | |
| Holly Harold | .... | co-producer | |
| Miles Millar | .... | executive producer | |
| Tim Scanlan | .... | supervising producer | |
Original Music by | |||
| Mark Snow | |||
Costume Design by | |||
| Melanie Williams | |||
Art Department | |||
| Kristina Lyne | .... | graphic designer | |
| Daniel Scarcello | .... | head sculptor | |
Sound Department | |||
| Jessica A. Dickson | .... | dialogue editor | |
Visual Effects by | |||
| Geeta Basantani | .... | lead compositor | |
| Geeta Basantani | .... | matte painter | |
| Jon Cowley | .... | visual effects supervisor: Entity FX | |
| Glenn Curry | .... | digital effects artist: EntityFX | |
| Rizza Go | .... | VFX Producer: Entity FX | |
| Nathan Ilejay | .... | I/O coordinator: Entity FX | |
| Brenda Ilic | .... | visual effects producer: Entity FX North | |
| Aaron N. Leichter | .... | I/O coordinator: Entity FX | |
| Andrew Lema | .... | digital effects artist | |
| Jack Noriaki Matsumoto | .... | lead 3D artist: EntityFX | |
| Steve J. McLeod | .... | digital effects artist | |
| Emily Sage | .... | visual effects production assistant | |
Stunts | |||
| Crystal Dalman | .... | stunt double | |
| Chris Webb | .... | stunt double | |
Camera and Electrical Department | |||
| James M. Jackson | .... | rigging electrician | |
| Randal Platt | .... | director of photography: second unit | |
Casting Department | |||
| Tiffany Mak | .... | casting assistant (uncredited) | |
Music Department | |||
| Louis Febre | .... | composer: score | |
Other crew | |||
| Winica Dewangga | .... | office production assistant | |
| Troy Rudolph | .... | assistant: Michael Rosenbaum | |
| Series Crew These people are regular crew members. Were they in this episode? |
Writing credits(in alphabetical order) | ||
| Alfred Gough | creator | |
| Miles Millar | creator | |
Art Direction by | |||
| James Philpott | |||
| Mark Soparlo | |||
| Sandi Tanaka | |||
Set Decoration by | |||
| Erik Gerlund | |||
| Laura Killam | |||
Costume Design by | |||
| Cynthia Ann Summers | (as Cynthia Summers) | ||
Makeup Department | |||
| Anji Bemben | .... | key hair stylist | |
| Kathleen P. Campbell | .... | hair stylist | |
| Joel Echallier | .... | makeup applicator | |
| Joel Echallier | .... | makeup effects supervisor | |
| Rachel Griffin | .... | special makeup effects artist | |
| Lisa Love | .... | makeup artist | |
| Lisa Love | .... | makeup supervisor | |
| Harlow MacFarlane | .... | special makeup effects artist | |
| Ryan Nicholson | .... | special makeup effects artist | |
| M. Brando Pero | .... | hair stylist | |
| Jessica Rain | .... | hair stylist | |
| Bill Terezakis | .... | special makeup effects designer | |
| Barbara J. Wozniak | .... | assistant hair stylist | |
| Vince Yoshida | .... | special makeup effects artist (uncredited) | |
Second Unit Director or Assistant Director | |||
| Karin Behrenz | .... | trainee assistant director | |
| Warren Hanna | .... | first assistant director: second unit | |
| Warren Hanna | .... | second assistant director | |
| Debra Herst | .... | second assistant director (season 5) | |
| Brad Jubenville | .... | second assistant director (as Brad Jubenvill) | |
| Douglas Mitchell | .... | second assistant director: second unit | |
| Sean Osmack | .... | trainee assistant director | |
| Wayne Rose | .... | second unit director | |
| Tanya Tagman | .... | trainee assistant director (as Tanya Tagmann) | |
| Paul Turner | .... | daily assistant director | |
| Paul Turner | .... | first assistant director: second unit | |
| Richard Worden | .... | first assistant director: second unit | |
Art Department | |||
| John Alvarez | .... | assistant art director | |
| Peter Bodnarus | .... | art department assistant/model builder | |
| Tim Dagley | .... | on-set dresser | |
| Jennifer Donaldson | .... | set designer | |
| Dustin Farrell | .... | assistant art director | |
| Phil Gough | .... | property master | |
| Mark Howes | .... | lead set dresser | |
| Denise Hutniak | .... | on-set dresser (2002) (2003) | |
| Terry Joseph | .... | assistant set decorator | |
| James Minchau | .... | props | |
| Tiara Motem | .... | property buyer | |
| Kimberley Regent | .... | property master | |
| Ric Walkington | .... | assistant property master | |
| Loree Wershler | .... | graphic designer | |
| Loree Wershler | .... | illustrator | |
| Ling Yang | .... | storyboard artist | |
| Gary Young | .... | sculptor | |
Sound Department | |||
| Gregg Barbanell | .... | foley artist | |
| Charles Bruce | .... | sound effects editor | |
| Gabrielle Gilbert Reeves | .... | dialogue editor | |
| Jeremy J. Gordon | .... | adr editor | |
| Jeremy J. Gordon | .... | sound editor | |
| Eric Gotthelf | .... | adr mixer | |
| Dave Griffiths | .... | boom operator | |
| David M. Horton | .... | sound effects editor | |
| Eric C. Hosmer | .... | sound effects editor | |
| Carolyn Motyer | .... | boom operator: second unit | |
| John Motyer | .... | sound mixer: second unit | |
| Rory O'Neill | .... | sound assistant: day call | |
| David Raines | .... | adr recordist | |
| Gary D. Rodgers | .... | sound re-recording mixer (as Gary D. Rogers) | |
| Graham Timmer | .... | day call sound assistant | |
| Lisa K. Wolf | .... | assistant sound editor | |
Special Effects by | |||
| Chris Bignell | .... | on set supervisor | |
| Dan Cervin | .... | special effects first assistant | |
| Gary Heidrick | .... | special effects assistant | |
| Ian Korver | .... | special effects assistant | |
| James Kozier | .... | special effects supervisor (season 1) | |
| Tim Storvick | .... | special effects coordinator (season 1) | |
| Joel Whist | .... | special effects coordinator | |
Visual Effects by | |||
| Simon Ager | .... | digital compositing artist | |
| Brian Bell | .... | digital artist | |
| Dan Blank | .... | digital compositor | |
| Neill Blomkamp | .... | 3D animator | |
| Joseph Brattesani | .... | digital compositor | |
| Nathan Brunskill | .... | tape operator | |
| Michael Carter | .... | digital compositing artist | |
| Trevor Cawood | .... | lead 3D animator | |
| Matthew Collorafice | .... | digital compositor: EntityFX | |
| Rick Cortes | .... | digital fixes and clean-up | |
| Dominic Daigle | .... | digital artist | |
| John Decker | .... | CG supervisor: R!OT Pictures | |
| Chris Doll | .... | digital compositing artist | |
| Eyal Erez | .... | senior effects animator | |
| Larry Ewing | .... | visual effects producer: View Studios | |
| Ben Funk | .... | digital compositing artist | |
| Don Greenberg | .... | digital compositing artist | |
| Jay Grunfeld | .... | digital compositor | |
| John H. Han | .... | CG supervisor: EntityFX | |
| John H. Han | .... | lead 3D artist: EntityFX | |
| John H. Han | .... | lead compositor: EntityFX | |
| John H. Han | .... | visual effects on-set supervisor: EntityFX | |
| Marlan Harris | .... | digital artist | |
| William Higgins | .... | compositor: EntityFX | |
| Yoshiko Hirata | .... | compositor: EntityFX | |
| Simon Holden | .... | digital compositor | |
| Eli Jarra | .... | compositor: EntityFX | |
| Michael Kaelin | .... | digital compositor | |
| Sara Lee | .... | visual effects | |
| Kymber Lim | .... | visual effects producer: EntityFX | |
| John Mitchell | .... | 3D artist: EntityFX | |
| Kenneth Nakada | .... | senior matte painter: R!OT Pictures | |
| Rik Panero | .... | 3D artist: EntityFX | |
| Rik Panero | .... | data I/O manager | |
| Brian Petras | .... | compositor: EntityFX | |
| Tricia Pifer | .... | visual effects coordinator: EntityFX (as Tricia Hefferman) | |
| Paul Patrick Quinn | .... | visual effects producer | |
| Madhava Reddy | .... | roto artist | |
| Diego Riestra | .... | match move artist | |
| Gregory S. Scribner | .... | digital artist | |
| Andrea Shear | .... | 3D artist: EntityFX | |
| Rick Shick | .... | digital compositor: compositing and rotoscoping | |
| Terry Shigemitsu | .... | lead animator: EntityFX | |
| Trent Smith | .... | digital producer: EntityFX | |
| Mark Spatny | .... | visual effects producer/supervisor: Modern VideoFilm | |
| Christopher Stewart | .... | 3D animator | |
| Cory Strassburger | .... | digital artist: View Studio | |
| Takashi Takeoka | .... | digital compositor | |
| Adrian Van Der Park | .... | 3D animator | |
| Grant Viklund | .... | digital artist | |
| Jeff West | .... | storyboards | |
| Jeff Zaman | .... | digital compositor | |
Camera and Electrical Department | |||
| Bruce Borland | .... | gaffer: second unit | |
| Bruce Borland | .... | rigging gaffer | |
| Rob Bruce | .... | camera operator | |
| John Carron | .... | playback operator | |
| Bradley S. Creasser | .... | camera operator (as Brad Creasser) | |
| Jack Cruikshank | .... | grip | |
| Rusty Deluce | .... | first assistant camera: "a" camera | |
| Geoffrey James Dixon | .... | electrician | |
| Cameron Drinkle | .... | video playback operator | |
| Rod Frew | .... | electrician | |
| David Goyer | .... | generator operator | |
| David Gray | .... | still photographer | |
| Aaron Haesler | .... | camera trainee (season 5) | |
| Junichi Hosoi | .... | camera operator: "b" camera | |
| Junichi Hosoi | .... | steadicam operator | |
| Dale H. Jahraus | .... | camera operator: "a" camera, second unit (season 5) | |
| Scott Kozak | .... | best boy grip: second unit | |
| Ross Long | .... | key rigging grip | |
| Noah Richoz | .... | digital video assist operator (2001) | |
| Gary Stamford | .... | lamp operator (season 2) | |
| Matthew Tichenor | .... | second assistant camera: "a" camera | |
| Max Torroba | .... | playback operator | |
Casting Department | |||
| Doreen Ferreira | .... | co-extras casting associate | |
| Sandra-Ken Freeman | .... | extras casting | |
| Marty Manifold | .... | extras casting assistant (seasons 1-2) | |
| Edward D. Rea | .... | casting associate | |
Costume and Wardrobe Department | |||
| Lynne Maureen Curtis | .... | wardrobe supervisor | |
| Marco Daxton | .... | key assistant costume designer | |
| Shane Deschamps | .... | costume set supervisor | |
| Steve Oben | .... | set costume supervisor | |
Editorial Department | |||
| Jessica E. Newman | .... | post-production assistant (2009) | |
| Jim Towne | .... | assistant editor | |
Music Department | |||
| Cedric Lemoyne | .... | composer: theme song "Save Me" and "Perfect Memory" | |
| Ernie Mannix | .... | music editor | |
| Gregory Slay | .... | composer: theme song "Save Me" and "Perfect Memory" | |
| Cinjun Tate | .... | composer: theme song "Save Me" and "Perfect Memory" | |
| Shelby Tate | .... | composer: theme song "Save Me" and "Perfect Memory" | |
| Theory of a Dead Man | .... | music performers: "Invisible Man" | |
| Jeffrey Cain Thompson | .... | composer: theme song "Save Me" and "Perfect Memory" (as Jeffrey Cain) | |
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Clark Kent sees what the world would be like without him in a milestone of an episode, the 150th of "Smallville." Clark realizes that a lot of grief and sorrow has come through him. He is reluctant to go back in time to Krypton to save Kara, and himself, because of the bad that in his mind is all his fault. Because of this (constant) self-evaluation, he wishes he had never been born. Jor-El shows him how incorrect Clark is in making that wish.
Once he sees how much danger the world would be under without him, Clark decides to return back in time to Krypton.
While an interesting episode in a 'It's A Wonderful Life' sort of format, it's unfortunate to see Clark still blaming himself for everything that has gone wrong with events near him. However, after emerging from the alternate reality, at least he realizes how much good he has brought to the world, and how much worse it could be without him. However, scenes from Krypton at the end of the episode tamper with the previous episodes of the show and the very basis of the myth. Basically, the writers' decision to go with a back-in-time conflict infringes upon previous established and epic facts that will leave you loving or hating this episode. Fortunately, a lot of their fans liked it.
Nods to the classic Lois and Clark relationship from the Superman story and the Smallville Lois and Clark's future are touched on in the alternate reality, which is a welcome story.