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| Cast | + Add Cast | 
| 17 cast members | 
| Name | Known for | 
|---|---|
| Peter Graves
 
Dr. Doug Paul Martin
 | |
| James Seay
 
Col. Banks
 | |
| Steve Pendleton
 
Briggs
 | |
| Frank Gerstle
 
Dr. Curt Kruger (as Frank Gerstel)
 | |
| John Frederick
 
Deneb / The Tala (as John Merrick)
 | |
| Barbara Bestar
 
Ellen Martin
 | |
| Shepard Menken
 
Maj. Clift (as Shep Menken)
 | |
| Jack Daly
 
Power House Guard
 | |
| Ron Gans
 
Sgt. Powers - Sentry (as Ron Kennedy)
 | |
| Ben Welden
 
Pilot - Tar Baby 2
 | |
| Burt Wenland
 
Sgt. Bandero
 | |
| Lester Dorr
 
Station Attendant
 | |
| Robert Roark
 
Guard
 | |
| Ruth Bennett
 
Miss Vincent - Secretary
 | |
| Mark Scott
 
Narrator (voice)
 | |
| Roy Engel
 
1st Police Dispatcher (uncredited)
 | |
| Coleman Francis
 
Guy in Power Plant Answering Phone (uncredited)
 |