Walter Reed
Kent Fowler
A hero single-handedly sets himself against Martians trying to assume control of Earth.
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Walter Reed
Kent Fowler
Lois Collier
Helen Hall
Gregory Gaye
Mota
James Craven
Bryant
Harry Lauter
Drake
Richard Irving
Ryan
Sandy Sanders
Steve
Michael Carr
Trent
Dale Van Sickel
Watchman [Ch. 1]
Tom Steele
Taylor
George Sherwood
Gate Guard [Ch. 7]
Jimmy O'Gatty
Grady
John De Simone
Curtis [Ch. 8]
Lester Dorr
Crane [Ch. 7, 11]
Dick Cogan
Kirk [Ch. 7]
Barry Brooks
Policeman in Bryant's Lab [Ch. 8]
Dick Crockett
Cave Thug #2 [Ch. 5]
John Daheim
Boyd, Shipping Clerk [Chs. 4-5]