| Rod Serling |
Sound |
| Maxine Stuart |
Tyler |
| Gig Young |
Sloan |
| Frank Overton |
Sloan |
| Burgess Meredith |
Bemis |
| Vaughn Taylor |
Verden Fell (archive footage) |
| Jacqueline deWit |
Bemis |
| Agnes Moorehead |
Verden Fell (archive footage) |
| Lloyd Bochner |
Michael |
| Susan Cummings |
Patty |
| Richard Kiel |
Verden Fell (archive footage) |
| Claude Akins |
Brand |
| Barry Atwater |
Goodman |
| Jack Weston |
Farnsworth |
| Irene Tedrow |
Sloan |
| Theo Marcuse |
Gregori |
| Ron Howard |
Wilcox |
| Byron Foulger |
Charlie |
| Lela Bliss |
Chester |
| William D. Gordon |
Doctor |
| Jennifer Howard |
Nurse |
| George Keymas |
Verden Fell (archive footage) |
| Douglas Heyes |
Astronaut |
| Hardie Albright |
Verden Fell (archive footage) |
| Bill Erwin |
Wilcox |
| Jan Handzlik |
Tommy |
| Burt Metcalfe |
Don |
| Mary Gregory |
Verden Fell (archive footage) |
| Pat O'Malley |
Verden Fell (archive footage) |
| Anne Barton |
Brand |
| Leah Waggner |
Goodman |
| Carleton Young |
Colonel |
| Ben Erway |
Verden Fell (archive footage) |
| Lyn Guild |
Farnsworth |
| Edson Stroll |
Verden Fell (archive footage) |
| Donna Douglas |
Tyler |
| Nelson Olmsted |
Verden Fell (archive footage) |
| Bartlett Robinson |
Colonel |
| Robert Tafur |
Valdes |
| Lomax Study |
Leveque |
| Jerry Fujikawa |
Verden Fell (archive footage) |