- Florence La Badie
- Florence Gray Hargreave
- Marguerite Snow
- Countess Olga Petroff
- James Cruze
- Jim Norton - Newspaper Reporter
- Frank Farrington
- Braine - a Conspirator
- Sidney Bracey
- Jones - Hargreave's Butler / Stanley Hargreave
- Alfred Norton
- Stanley Hargreave - the Millionaire
- Lila Chester
- Susan Farlow - Florence's Companion
- Creighton Hale
- Gang Member
- Mitchell Lewis
- Gang Leader
- Donald Gallaher
- (as Donald Gallagher)
- Madeline Fairbanks
- (as The Fairbanks Twins)
- Marion Fairbanks
- (as The Fairbanks Twins)
- Claire Kroell
- Russian Princess Parlova
- Billy Sullivan
- (as William A. Sullivan)
- Julie Cruze
- (as Baby Julie Cruze)
- Albert Froom
- Conspirator
- N.Z. Wood
- (as Nick Woods)
- Mignon Anderson
- Cameo Appearance
- John Burke
- Cameo Appearance, Episode 21
- Peggy Burke
- A Spy for the Conspirators
- James Beauchamp Clark
- Cameo Appearance, Episode 21
- The Duke of Manchester
- Cameo Appearance, Episode 7
- Lindley M. Garrison
- Cameo Appearance, Episode 21
- Roy Hauck
- Best Man
- Daniel Keleher
- (as Dave Keleher)
- Thomas R. Marshall
- Cameo Appearance, Episode 21
- A. Leo Stevens
- Aviator
- Mae Tinee
- Cameo Appearance, Episode 11
- May Wallace
- The Wife
- Archibald White
- Cameo Appearance, Episode 7
