- Eric Roberts
- Ethan Marcos
- Arianna Renee
- Dr. Linda Murphy
- Katie Sereika
- Eva Kuleshov
- Shayne Hartigan
- Lab Tech Jones / Blair
- Narek Kirakossian
- Secretary Pudovkin
- Irina Pickard
- Chemist Eisenstein
- Rudy Bentz
- Noah Murphy
- Gregg Marcantel
- General Reynolds
- R.J. Wagner
- General Delaney
- Malcolm Green
- Marine Corporal Myers
- Quinn Baker
- Specialist Sgt. Shaw
- Buck Burns
- MP McDaniels
- Sir Salonis
- St. Peterson / Harker (as Sir Gregory Salonis)
- Lynda Lopez
- News Anchor
- Bolnarat
- Self
- Malcolm T. Green
- Marine Meyers
- Jonah
- Self
- Alexander Nunn
- Scientist VO
