| David Duchovny | Fox Mulder |
| Gillian Anderson | Dana Scully |
| Jesse L. Martin | Josh Exley |
| Fredric Lehne | Young Arthur Dales
(as Fredric Lane) |
| Brian Thompson | Alien Bounty Hunter |
| Jesse James | Poor Boy |
| Lou Beatty Jr. | Black Coach |
| Burnell Roques | Buck Johnson |
| M. Emmet Walsh | Arthur Dales |
| Lennie Loftin | Coranado |
| Paul Willson | Ted |
| Walter Phelan | Alien
(as Walter T. Phelan Jr.) |
| Gabriel Clifton | Black Kid |
| Al Kaplon | Ump |
| Robb Reesman | Macon Cop |
| Daniel Ducovny | Piney
(as Daniel Duchovny) |
| Chris Kohn | Catcher |
| Ken Medlock | White Coach |
| Julie Griffith | Beautiful Woman |
| Kerric MacDonald | Moose |
| Paul Douglas Brown | Alien
(uncredited) |
| Christie McNew | Baseball Game Patron
(uncredited) |
| Vin Scully | Baseball Announcer
(voice) (uncredited) |