Blackhawk
Laska
Chuck
Mr. Case
Olaf
Stan / Boris
Andre
Chop Chop
Bork
Cress
Aller
Dyke
Dr. Rolph [Chs. 4-7]
Hodge [Chs. 11-14]
Hendrickson [Chs. 1-2, 4, 8-9]
Malcolm Smith [Ch. 10]
Dawson [Chs. 7-8]
Otto Helger [Chs. 12-13]
Narrator (voice)
