- Adam Baldwin
- Wilson
- Beau Billingslea
- Abraham Douglas
- Kim Buckingham
- Talbert
- Jim Byrnes
- Theodore Roosevelt
- Joey D'Auria
- Nikola Tesla
- Kennie Dowle
- Robert Wells / Lt Hendrix / Leviathan Bridge Officer (voice)
- Tony Eusoff
- Lieutenant Raja Iskandar Shah
- Elizabeth Gracen
- Lt.Jennifer Carter
- Alexander Henderson
- Young Eric Wells
- Amelia Henderson
- Young Girl
- Susan Lankester
- Christine Wells
- Matt Letscher
- Capt. Manfred von Richtofen
- Robert Middleton
- General Sergei Kushnirov
- Christina Orow
- Leviathan Ensign
- Adrian Paul
- Patrick O'Brien
- Jay Sheldon
- Austrian Officer / Wounded Scout Pilot / Additional Voices (voice)
- Mark Sheppard
- Sean O'Brien
- Mike Swift
- A.R.E.S. General
- James Arnold Taylor
- German Soldiers / Russian Soldiers (voice)
- Peter Wingfield
- Capt.Eric Wells
- Gavin Yap
- Helmsman
- Brian Zimmerman
- British Officer in Green Man Pub
