| Jena Malone | .... | Young Ellie | |
| David Morse | .... | Ted Arroway | |
| Jodie Foster | .... | Ellie Arroway | |
| Geoffrey Blake | .... | Fisher | |
| William Fichtner | .... | Kent | |
| Sami Chester | .... | Vernon | |
| Timothy McNeil | .... | Davio | |
| Laura Elena Surillo | .... | Cantina Woman | |
| Matthew McConaughey | .... | Palmer Joss | |
| Tom Skerritt | .... | David Drumlin | |
| Henry Strozier | .... | Minister | |
| Michael Chaban | .... | Hadden Suit | |
| Max Martini | .... | Willie (as Maximilian Martini) | |
| Larry King | .... | Himself | |
| Thomas Garner | .... | Ian Broderick | |
| Conroy Chino | ... | KOB-TV Reporter | |
| Dan Gifford (II) | .... | Jeremy Roth | |
| James Woods | .... | Michael Kitz | |
| Vance Valencia | .... | Senator Valencia | |
| Angela Bassett | .... | Rachel Constantine | |
| Donna J. Kelley | .... | Herself | |
| Leon Harris | .... | Himself | |
| Claire Shipman | .... | Herself | |
| Behrooz Afrakhan | .... | Middle Eastern Anchor | |
| Saemi Nakamura | .... | Japanese Anchor | |
| Maria Celeste Arrara | .... | Latina Anchor | |
| Tabitha Soren | .... | Herself | |
| Geraldo Rivera | .... | Himself | |
| Ian Whitcomb (II) | .... | British Anchor | |
| Jay Leno | .... | Himself | |
| Natalie Allen | .... | Herself | |
| Robert D. Novak | .... | Himself | |
| Geraldine A. Ferraro | .... | Herself | |
| Ann Druyan | .... | Herself | |
| Rob Lowe | .... | Richard Rank | |
| Jake Busey | .... | Joseph | |
| Kathleen Kennedy | .... | Herself | |
| Michael Albala (I) | .... | Decryption Hacker | |
| Ned Netterville | .... | Decryption Expert | |
| Leo Lee | .... | Major Domo | |
| John Hurt | .... | S.R. Hadden | |
| William Jordan (I) | .... | Chairman of Joint Chiefs | |
| David St. James | .... | Joint Chief | |
| Jill Dougherty | .... | Herself | |
| Haynes Brooke | .... | Drumlin Aide | |
| John Holliman | .... | Himself | |
| Bobbie Battista | .... | Herself | |
| Dee Dee Myers | .... | Herself | |
| Bryant Gumbel | .... | Himself | |
| Linden Soles | .... | Himself | |
| Steven Ford | .... | Major Russell | |
| Alexander Zemeckis | .... | Major Russell's Son (as Alex Zemeckis) | |
| Janie Peterson | .... | Major Russell's Daughter | |
| Philippe Bergeron (I) | .... | French Committee Member (as Phillip Bergeron) | |
| Jennifer Balgobin | .... | Dr. Patel | |
| Anthony Hamilton (II) | .... | British Committee Member (as Anthony Fife Hamilton) | |
| Rebecca T. Beucler | .... | NASA Public Relations | |
| Marc Macaulay | .... | NASA Technician | |
| Pamela Wilsey | .... | Voice of NASA | |
| Tucker Smallwood | .... | Mission Director | |
| Jeff Johnson (I) | .... | Mechanical | |
| Yuji Okumoto | .... | Electrical | |
| Gerry Griffin | .... | Dynamics | |
| Brian Alston | .... | Communications | |
| Rob Elk | .... | Pad Leader | |
| Mark Thomason (I) | .... | Security | |
| José Rey | .... | Controller #8 | |
| Todd Patrick Breaugh | .... | New VLA Technician | |
| Alex Veadov | ... | Russian Cosmonaut | |
| Alice Kushida | Scientist | ||
| Robin Gammell | .... | Project Official | |
| Richardson Morse | .... | Mission Doctor | |
| Seiji Okamura | .... | Japanese Ensign | |
| Bernard Shaw (I) | .... | Himself | |
| Mak Takano | .... | Japanese Tech #1 | |
| Tom Tanaka | .... | Japanese Tech #2 | |
| Catherine Dao | .... | Life Support | |
| Kristoffer Ryan Winters | .... | Dynamics #2 | |
| Valorie Armstrong | .... | Woman Senator | |
| Jim Hild | .... | Reporter #5 | |
| Bill Thomas (III) | .... | Reporter #6 | |
| Diego Montoya | .... | School Boy | |
El resto del casting listado alfabeticamente |
|||
| Neil Armstrong (I) | .... | Himself (voice through space) (voice) (uncredited) | |
| Bill Clinton | .... | Himself (uncredited) | |
| Candice Cook | .... | Supporter (uncredited) | |
| Adolf Hitler | .... | Himself (archive footage) (uncredited) | |
| Martin Luther King | .... | Himself (voice through space) (voice) (uncredited) | |
| Robert Leighton (X) | .... | Nasa Controller #2 (uncredited) | |
| Sunshine Logroño | .... | Puertorrican taxi driver (uncredited) | |
| Douglas MacArthur | .... | Himself (voice through space) (voice) (uncredited) | |
| Richard Nixon | .... | Himself (voice through space) (voice) (uncredited) | |
| Paul L. Nolan | .... | Ellie's Attorney (uncredited) | |
| Franklin Delano Roosevelt | .... | Himself (voice through space) (voice) (uncredited) | |
| Walter Winchell | .... | Himself (voice through space) (voice) (uncredited) | |
Director: Robert Zemeckis
Historia de Carl Sagan y Ann Druyan
Escenografía: James V. Hart y Michael Goldenberg
Productores:
| Steven J. Boyd | associate producer | |
| Joan Bradshaw | executive producer | |
| Ann Druyan | co-producer | |
| Lynda Obst | executive producer | |
| Rick Porras | associate producer | |
| Carl Sagan | co-producer | |
| Steve Starkey | producer | |
| Robert Zemeckis | producer |
Música original: Alan Silvestri
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