
| Dennis Farina | ... | Himself (174 episodes, 2008) |

| Robert Stack | ... | Himself - Host / ... (27 episodes, 1987-2002) |
 | Christopher Chacon | ... | Himself (7 episodes, 1991-1995) |

| Robert Amico | ... | Billy Hawkins / ... (4 episodes, 1999-2002) |
 | Elliott Grey | ... | Missing Student's Father (4 episodes, 2001) |

| Amy Lyndon | ... | Alison / ... (3 episodes, 1987-2002) |
 | Cailyn Taylor | ... | Baby Girl / ... (3 episodes, 1992-1999) |

| R. Emmett Fitzsimmons | ... | Detective / ... (3 episodes, 1995-1996) |
 | Gianni Lazuli | ... | Child Mugger / ... (2 episodes, 1989-1990) |
 | Sophia Lansky | ... | Anna, the Scheming Household Manager / ... (2 episodes, 1991-1994) |

| Tracy Miller | ... | Eliot Ness (2 episodes, 1991-1992) |

| Don Shirey | ... | Colonel / ... (2 episodes, 1991-1992) |

| Simone Alex | ... | Bank Teller / ... (2 episodes, 1991) |
 | Loren Coleman | ... | Cryptozoologist / ... (2 episodes, 1992-1996) |

| Douglas Stewart | ... | Abraham Staab / ... (2 episodes, 1992) |
 | Caroline Vinciguerra | ... | Julie Cooper (2 episodes, 1992) |

| Steve Howard | ... | George Carhart / ... (2 episodes, 1993-1996) |

| JB Warren | ... | Officer Buchanan (2 episodes, 1993-1994) |

| Trent Walker | ... | Lowell (2 episodes, 1993) |
 | Taylor Masamitsu | ... | Kid 1 (2 episodes, 1994-1999) |

| Tony Devon | ... | Detective Nelson / ... (2 episodes, 1995-2002) |

| Miguel Mas | ... | Killer Father (2 episodes, 1995-2001) |

| Katrina Romanoff | ... | Diamond Ring Girl / ... (2 episodes, 1995-2001) |
 | Michael D. Jones | ... | Autograph Seeker / ... (2 episodes, 1995) |

| Mark Jeffrey Miller | ... | Richard Cepulonis (2 episodes, 1996) |
 | Gary Wade Morton | ... | Armed bank robber / ... (2 episodes, 1996) |

| Joe Howard | ... | Convenience Store Owner / ... (2 episodes, 1998-2001) |

| Steve Nave | ... | James Sullivan / ... (2 episodes, 1998-2001) |
 | Joe Rodriguez | ... | FBI Agent (2 episodes, 1998) |

| Gerald Brodin | ... | Darren Rotere / ... (2 episodes, 2001-2002) |

| Rainy Kerwin | | (2 episodes, 2001-2002) |
 | John Strand | ... | Police Negotiator (2 episodes, 2001-2002) |
 | James Callahan | ... | Keith Jones / ... (2 episodes, 2001) |

| Bob Sattler | ... | Police Detective / ... (2 episodes, 2001) |

| Peter Mark Vasquez | ... | Arthur Lopez Sr (2 episodes, 2001) |

| Honey Lauren | ... | 2002 (2 episodes, 2002) |
 | Linda Rochelle | ... | Darlene (2 episodes, 2002) |
 | Larry Gamell Jr. | ... | District Attorney / ... (2 episodes) |

| Peg Sheldrick | ... | Orphanage Worker / ... (2 episodes) |
|
 | Raymond Burr | ... | Himself - Host / ... (unknown episodes, 1987) |

| Karl Malden | ... | Himself - Host / ... (unknown episodes, 1987) |

| Keely Shaye Smith | ... | Herself - Correspondent (unknown episodes, 1995-1997) |

| Virginia Madsen | ... | Herself - Co-Host (unknown episodes, 1999) |
|
| John Cosgrove | .... | executive producer / producer (182 episodes, 1989-2008) |
| Terry Dunn Meurer | .... | executive producer (176 episodes, 1999-2008) |
| Stuart Schwartz | .... | co-executive producer / supervising producer (175 episodes, 2008) |
| Jeannie O'Neill | .... | field producer (78 episodes, 1993-1998) |
| Andrea Masamitsu | .... | associate producer (45 episodes, 1989-2002) |
| Stacy Schneider | .... | producer / segment producer (9 episodes, 1990-1996) |
| Carey Lundin | .... | assistant producer (3 episodes, 1990-1992) |
| Michael Palazzolo | .... | producer (2 episodes, 1993-1995) |
| Emily Berry | .... | producer (2 episodes, 1995-2001) |
| Grazia Caroselli | .... | segment producer (2 episodes, 1995-1998) |
|
| Chris Pye | .... | supervising producer (unknown episodes, 1988-1990) |
| Victoria Dew | .... | segment producer (unknown episodes, 2001) |
| Vera Golakova | .... | field producer / segment associate producer (unknown episodes, 2001) |
| Kimberly Austin | .... | segment producer (unknown episodes, 2002) |
| Shari Adagio | .... | associate producer (unknown episodes) |
| Raymond Bridgers | .... | supervising producer (unknown episodes) |
| Phyllis Coblentz | .... | producer (unknown episodes) |
| Artie Glackin | .... | field producer (unknown episodes) |
| Ed Horwitz | .... | supervising producer (unknown episodes) |
| Sally Howell | .... | senior producer (unknown episodes) |
| Randall Kirk | .... | story producer (unknown episodes) |
| John Latenser V | .... | field producer (unknown episodes) |
| John McLaughlin | .... | segment producer (unknown episodes) |
| Elizabeth Meeker | .... | segment producer (unknown episodes) |
| Thomas Nelson | .... | host producer / segment producer (unknown episodes) |
| Al Nowicki | .... | host producer (unknown episodes) |
| Christopher Poole | .... | segment producer (unknown episodes) |
| Richard Roraback | .... | segment producer (unknown episodes) |
| Karen S. Shapiro | .... | senior producer (unknown episodes) |
| Timothy Stone | .... | segment producer: 2 episodes, 1998 (unknown episodes) |
| Chris Worthington | .... | segment producer (unknown episodes) |
| |
|
| Susan Reese | .... | production assistant (3 episodes, 1998) |
| Melissa A. Wong | .... | script supervisor (3 episodes, 2008) |
| Jai Cherney | .... | location manager (2 episodes, 1995) |
| Zoe Cote | .... | segment producer (2 episodes, 2008) |
|
| Symon Mink | .... | location manager: New York / production assistant: Buffalo (unknown episodes, 1995-1996) |
| Tina Trevarrow | .... | production assistant (unknown episodes, 1995-1996) |
| Christopher K. Grap | .... | production assistant (unknown episodes, 1998-1999) |
| Nick Marcou | .... | production assistant (unknown episodes, 1999) |
| Richard Fontenot | .... | location scout (unknown episodes, 2001-2002) |
| Rory Dauson | .... | location manager (unknown episodes, 2002) |
| Robert Bendick | .... | office production assistant / set production assistant (unknown episodes) |
| Joe Cacciotti | .... | production assistant (unknown episodes) |
| Loren Coleman | .... | consultant: suicidology and cryptozoology (unknown episodes) |
| Rachel Dickson | .... | production assistant (unknown episodes) |
| Payton Dunham | .... | location scout / set production assistant (unknown episodes) |
| Nan Garcia-Wood | .... | baby nurse (unknown episodes) |
| David T. Huang | .... | production assistant (unknown episodes) |
| Jiri Husak | .... | production assistant (unknown episodes) |
| Michael D. Jones | .... | host telecenter producer / unit production coordinator (unknown episodes) |
| Walter H. Norris | .... | set production assistant (unknown episodes) |
| Steve Parys | .... | location manager / location scout (unknown episodes) |
| Errol Reichow | .... | location manager (unknown episodes) |
| Michael Sandknop | .... | production assistant: St. Louis (unknown episodes) |
| Matthew Shields | .... | production assistant (unknown episodes) |
| Timothy Stone | .... | segment producer (unknown episodes) |
| Marc J. Ventimiglia | .... | location manager (unknown episodes) |
| Victoria A. Zamora | .... | assistant production accountant (unknown episodes) |
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