| Once again, Earth is the battleground. But now the aliens whose human guise hides their true reptilian natures are wiser. They believe the secret to their survival on Earth lies in the DNA of the newly born half-human, half-spaceling Starchild. But that's something the world's Resistance Fighters cannot allow. |
| Name | Character | Episodes |
|---|---|---|
| Marc Singer | Mike Donovan | 19 |
| Robert Englund | Willie | 19 |
| Faye Grant | Julie Parrish | 19 |
| Jeff Yagher | Kyle Bates | 19 |
| Jane Badler | Diana | 19 |
| June Chadwick | Lydia | 19 |
| Jennifer Cooke | Elizabeth | 19 |
| Lane Smith | Nathan Bates | 13 |
| Michael Ironside | Ham Tyler | 12 |
| Blair Tefkin | Robin Maxwell | 12 |
| Michael Wright | Elias Taylor | 11 |
| Aki Aleong | Mr. Chiang | 9 |
| Judson Scott | Lt. James | 8 |
| Howard K. Smith | Howard K. Smith | 8 |
| Frank Ashmore | Philip | 6 |
| Bruce Davison | John Langley | 3 |
| Mickey Jones | Chris Farber | 3 |
| Duncan Regehr | Charles | 3 |
| Peter Elbling | Oswald | 3 |
| Nicky Katt | Sean Donovan | 2 |
| Sheryl Lee Ralph | Glenna | 2 |
| Sherri Stoner | Jessie Courtney | 1 |
| Judyann Elder | Mrs. Caniff | 1 |
| Jeff Kober | Visitor Officer | 1 |
| Sybil Danning | Mary Kruger | 1 |
| Wendy Fulton | Glenda | 1 |
| Deborah Wakeham | Kathy Courtney | 1 |
| Casey Sander | Visitor Chasing Horse | 1 |
| R. D. Call | Visitor Messenger | 1 |
| Kay E. Kuter | Richards | 1 |
| Darleen Carr | Joanne Davis | 1 |
| Jenny Beck | Elizabeth Maxwell | 1 |
| Jenny Beck | Young Elizabeth Clone | 1 |
| Nancy Lenehan | Science Frontiers Scientist | 1 |
| Anthony James | Laird | 1 |
| Ernest Harden Jr. | Reggie | 1 |
| Marilyn Jones | Thelma | 1 |
| Beau Starr | Hostage Guard | 1 |
| Leslie Bevis | Angela | 1 |
| Terence Knox | Alan Davis | 1 |
| William Wellman Jr. | Father Turney | 1 |
| Hugh Gillin | Sheriff 'Big John' Roland | 1 |
| Richard Epcar | Louis | 1 |
| Fritz Ford | Visitor Guard | 1 |
| Brett Cullen | Robert | 1 |
| Keri Houlihan | Jennifer | 1 |
| Connie Sawyer | Old Woman | 1 |
| Chad McQueen | Dean Boddicker | 1 |
| James Ingersoll | Theater Manager | 1 |
| Frank Ashmore | Martin | 1 |
| Thomas Bellin | Raymond | 1 |
| Russ McCubbin | Deputy Carnes | 1 |
| Josh Richman | Henry Atkins | 1 |
| Reggie Johnson | Bart | 1 |
| J.J. Cohen | Tony Baker | 1 |
| Ed Call | Man giving Diana a Ride | 1 |
| John Calvin | Dr. Stephen Maitland | 1 |
| Linden Chiles | Air Force General | 1 |
| Charles Walker | Skinny Visitor | 1 |
| Anthony De Longis | Ghalen | 1 |
| James Daughton | Dennis | 1 |
| Ken Olandt | Nigel | 1 |
| Valentin de Vargas | Bates Henchman | 1 |
| Robert Dowdell | Visitor Doctor | 1 |
| Barry Jenner | Visitor Bridge Technician | 1 |
| Richardson Morse | Doctor | 1 |
| Michael Champion | Garrison | 1 |
| Chip Heller | Visitor Guard | 1 |
| Steven Barr | Visitor Judge | 1 |
| Gary Dubin | Visitor Messenger | 1 |
| Gustav Vintas | Visitor Chef | 1 |
| Robert Rothwell | Uniform Cop | 1 |
| Kirk Scott | Helicopter Pilot | 1 |
| Rhonda Aldrich | Ellen Baker | 1 |
| Conrad Janis | Dr. David Atkins | 1 |
| Robert Hooks | George Caniff | 1 |
| Ina Fried | John Davis | 1 |
| Vince McKewin | Visitor | 1 |
| Richard Minchenberg | Howie | 1 |
| Don Maxwell | Captain Roland | 1 |
| Rod Browning | Diana's Pilot | 1 |
| David Abbott | Visitor Comm Officer | 1 |
| Dean Abston | Simon | 1 |
| Kurt Smildsin | Visitor | 1 |