- Warren Hull
- Bill MacGregor
- Kay Linaker
- Sonia Manning
- Wilhelm von Brincken
- Professor Werner
- George Cleveland
- John MacGregor
- Fern Emmett
- Aunt Mary
- Edward Keane
- Newspaper Editor
- Willy Castello
- Eric Bowman
- John Sheehan
- Marden
- Herbert Corthell
- Pete
- Vince Rush
- Gruen
- Tristram Coffin
- Newspaper Reporter
- I. Stanford Jolley
- German Agent
- Paul Newlan
- German Agent
- Hans Wollenberger
- Mueller
