| Stephen Hawking | ... | Himself - Host | |
| Sam Waterston | ... | Havelman | |
| Judy Davis | ... | Dr. Deanna Evans | |
| Allison Hossack | ... | Kelly Prosky | |
| Tom Butler | ... | Warren Geslow | |
| Robert Moloney | ... | Pierce | |
| Terence Kelly | ... | Goldstone | |
| Gary Chalk | ... | General (as Gary Chalk) | |
| Peter Bryant | ... | Dr. Gavin | |
| McKye Kelly | ... | Claire | |
| Peter Hall | ... | Nick | |
| Burkely Duffield | ... | Will | |
| Camyar Chai | ... | Mansur | |
| Malaya Cooks | ... | Technician |
| Stephen Hawking | ... | Himself - Host | |
| Terry O'Quinn | ... | Albert Skynner | |
| Elisabeth Röhm | ... | Lt. Granger | |
| William B. Davis | ... | The President | |
| Julian Christopher | ... | General Mackenzie (as Julian D Christopher) | |
| Malcolm Stewart | ... | Col. Dingham | |
| Doron Bell | ... | Kirby | |
| Samir El Sharkawi | ... | The Iraqi | |
| Dave Lantaigne | ... | Army Officer | |
| Adrian Mcmorran | ... | The Medic | |
| Dean Marshall | ... | The General's Aide | |
| Hiro Kanagawa | ... | Captain Oguchi | |
| Johannah Newmarch | ... | Assistant | |
| Mitra Loraz | ... | Palestinian Woman | |
| Andre Fex | ... | French Leader | |
| Deni DeLory | ... | Interpreter | |
| Veena Sood | ... | Dr. Kashani | |
| Parm Soor | ... | Pakistani Leader | |
| Scott E. Miller | ... | Technician | |
| Eddy Ko | ... | Chinese Leader | |
| Igor Ingelsman | ... | Russian Leader | |
| Laura Soltis | ... | Skynner's Wife | |
| Ben Cotton | ... | Creature |
| Stephen Hawking | ... | Himself - Host (as Professor Stephen Hawking) | |
| Malcolm McDowell | ... | Cargrew | |
| Anne Heche | ... | Martha Van Vogel | |
| Russell Porter | ... | Bronson | |
| Jason Diablo | ... | Jerry | |
| Bill Dow | ... | McCoy | |
| Sonja Bennett | ... | Judge Pomfrey | |
| Richard Ian Cox | ... | Pudgy Dodge | |
| Val Cole | ... | The Anchorman | |
| Osmond L. Bramble | ... | The Bailiff | |
| Matty Finochio | ... | Judge #2 | |
| David Neale | ... | Pyramus | |
| Jeanie Cloutier | ... | Judge #3 | |
| Nicholas Podbrey | ... | Ben |
| Stephen Hawking | ... | Himself - Host (as Professor Stephen Hawking) | |
| John Hurt | ... | Samswope | |
| Brian Dennehy | ... | Bedzyk | |
| James Denton | ... | Barney Curran | |
| Gina Chiarelli | ... | Annie | |
| Lori Ann Triolo | ... | Harmony Teet (as Lori Triolo) | |
| Donny Lucas | ... | Steve | |
| Vicky Lambert | ... | Frenchy | |
| Alex Zahara | ... | Bucky | |
| Leanne Adachi | ... | Sharon | |
| Jason Diablo | ... | Smiler | |
| Brian Dobson | ... | Samswope 2 (voice) | |
| Barbara Kottmeier | ... | Sis | |
| Harlan Ellison | ... | Nate | |
| Ken Kramer | ... | Schmool | |
| Gillian Barber | ... | Dr. Goldstein |
| Stephen Hawking | ... | Himself - Host | |
| Kimberly Elise | ... | Tilly Vee | |
| Clifton Collins Jr. | ... | Frendon Blythe | |
| Garwin Sanford | ... | Judge - The Court | |
| Daryl Shuttleworth | ... | Otis Brill | |
| Matthew Walker | ... | Augustus | |
| Jorge Vargas | ... | Young Man (as Jorgito Vargas Jr.) | |
| Lorena Gale | ... | Mary - Mother | |
| Shelley MacDonald | ... | Female Guard | |
| Nicole Muñoz | ... | Frightened Girl (as Nicole Munoz) | |
| Adrien Dorval | ... | Officer Bernard | |
| Keith Dallas | ... | Officer Labey | |
| Joanna Reid | ... | Defense Attorney | |
| Carlos Joe Costa | ... | Juror #3 - Kwame | |
| Alex Kliner | ... | Juror #1 - Jessup | |
| Alexia Fast | ... | Juror #4 - Ginnie | |
| Doreen Ramus | ... | Juror #2 - Renee | |
| Greg Chan | ... | Old Chinese Man - Juror #8 | |
| Jim Shepard | ... | Middle Aged White Man - Juror #6 | |
| Ray G. Thunderchild | ... | Native American Man - Juror #7 | |
| John Burnside | ... | Juror #9 | |
| Ellen Ewusie | ... | Black Woman - Juror #5 | |
| Donna Yamamoto | ... | Asian Police Woman | |
| Louis Chirillo | ... | Interrupt Progarm 91 | |
| Jeni Le Gon | ... | Juror #10 | |
| Nimet Kanji | ... | Juror #11 | |
| Esme Lambert | ... | Juror #12 |
| Stephen Hawking | ... | Himself - Host | |
| James Cromwell | ... | Randolph Ludwin | |
| Sean Astin | ... | Charlie Kramer | |
| Vincent Gale | ... | Jack Valentine | |
| Stacy Grant | ... | Sarah Moser | |
| Christine Chatelain | ... | Marissa Summer | |
| Michael Kopsa | ... | Ratcliffe | |
| Sally Kellerman | ... | The Watchbird (voice) | |
| Viv Leacock | ... | Willy | |
| Dean Redman | ... | Bradley Tanner | |
| David Abbott | ... | President | |
| Ivan De Leon | ... | Hispanic Youth #1 | |
| Andreas Abbondanza | ... | Hispanic Youth #2 | |
| Ken Camroux-Taylor | ... | Summer | |
| A.B. Chater | ... | Terrorist #1 | |
| Mehdi Darvish | ... | Terrorist #2 | |
| Sean O. Roberts | ... | Mugger (as Sean Owen Roberts) | |
| Alistair Abell | ... | SWAT Leader | |
| Gerry South | ... | Gunman | |
| Vanesa Tomasino | ... | Housekeeper | |
| Jill Krop | ... | Newscaster | |
| Link Baker | ... | Technician | |
| Mark Docherty | ... | TV Newscaster | |
| Paul Herbert | ... | Medical Technician |