Kirk Alyn

Blackhawk

Carol Forman

Laska

John Crawford

Chuck

Michael Fox

Mr. Case

Don C. Harvey

Olaf

Rick Vallin

Stan / Boris

Larry Stewart

Andre

Weaver Levy

Chop Chop

Zon Murray

Bork

Nick Stuart

Cress

Marshall Reed

Aller

Pierce Lyden

Dyke

William Fawcett

Dr. Rolph [Chs. 4-7]

Rory Mallinson

Hodge [Chs. 11-14]

Frank Ellis

Hendrickson [Chs. 1-2, 4, 8-9]

Marshall Bradford

Malcolm Smith [Ch. 10]

Frank Gerstle

Dawson [Chs. 7-8]

Charles Horvath

Otto Helger [Chs. 12-13]

Knox Manning

Narrator (voice)