 Jimmy HuntDavid Maclean | David Maclean |
 Arthur FranzDr. Stuart Kelston | Dr. Stuart Kelston |
 Helena CarterDr. Pat Blake, MD | Dr. Pat Blake, MD |
 Leif EricksonMr. George MacLean | Mr. George MacLean |
 Hillary BrookeMrs. Mary MacLean | Mrs. Mary MacLean |
 Morris AnkrumCol. Fielding | Col. Fielding |
 Walter SandePolice Sgt. Mack Finlay | Police Sgt. Mack Finlay |
 Bert FreedPolice Chief A.C. Barrows | Police Chief A.C. Barrows |
 Max WagnerArmy Sgt. Rinaldi | Army Sgt. Rinaldi |
| CCharles GibbLt. Blair | Lt. Blair |
 Milburn StoneArmy Capt. Roth | Army Capt. Roth |
 Douglas KennedyOfficer Jackson | Officer Jackson |
 Charles CaneOfficer Blaine | Officer Blaine |
 Fay BakerMrs. Wilson | Mrs. Wilson |
 Janine PerreauKathy Wilson | Kathy Wilson |
 John EldredgeMr. Turner | Mr. Turner |
 Barbara BillingsleyKelston's Secretary | Kelston's Secretary |
 Richard DeaconMP | MP |
| GGil HermanMajor Clary | Major Clary |
| LLuce PotterThe Martian Intelligence | The Martian Intelligence |
 Lock MartinMutant Carrying David to 'Intelligence' | Mutant Carrying David to 'Intelligence' |
| MMax PalmerSecond Mutant Guarding the "Intelligence" | Second Mutant Guarding the "Intelligence" |
 Todd KarnsJim the Gas Station Attendant | Jim the Gas Station Attendant |
 Frank WilcoxPentagon Chief of Staff | Pentagon Chief of Staff |
 Robert ShayneDr. William Wilson | Dr. William Wilson |
 William PhippsSgt. Baker | Sgt. Baker |
 William ForrestCol. Mayberry | Col. Mayberry |
 Peter BroccoBrainard (bit) | Brainard (bit) |
