Full Cast - Big O, The (TV) (episodes 1 to 13)
- 1. Roger the Negotiator
Episodic: Jane Alan (Announcement), Robert Wicks (Beck Gold), Simon Isaacson (Miguel Soldano)
Additional Voices: Elliot Reynolds, Guy Pinkham, Meson LaPayote, Richard Plantagenet
- 2. Dorothy, Dorothy
Recurring: Ethan Murray (Preview Narrator)
Episodic: Robert Wicks (Beck Gold)
Additional Voices: Elliot Reynolds, Guy Pinkham, Joe Romersa, Meson LaPayote, Richard Plantagenet
- 3. Electric City
Recurring: Ethan Murray (Preview Narrator)
Episodic: Ray Michaels (Sven Marisky)
Additional Voices: Devon Michaels, Elliot Reynolds, Guy Pinkham, Meson LaPayote, Richard Plantagenet
- 4. Underground Terror
Recurring: Alfred Thor (Alex Rosewater), Ethan Murray (Preview Narrator)
Episodic: Michael McConnohie (Michael Seebach / Schwartzvald)
Additional Voices: Dean Michaels, Elliot Reynolds, Guy Pinkham, Meson LaPayote, Richard Plantagenet
- 5. Bring Back My Ghost
Recurring: Ethan Murray (Preview Narrator)
Episodic: Peter Spellos (Rick Frazier), Robert Axelrod (Col. Gaust), Steve Kramer (Bonnie Frazier)
Additional Voices: Elliot Reynolds, Jonathan C. Osborne
- 6. A Legacy of Amadeus
Recurring: Ethan Murray (Preview Narrator)
Episodic: Anthony Mozdy (Gisang), Sparky Thornton (R. Instro)
Additional Voices: Jonathan C. Osborne
- 7. The Call from the Past
Recurring: Alfred Thor (Alex Rosewater), Ethan Murray (Preview Narrator)
Episodic: Gil Starberry (Riderman)
Additional Voices: Ethan Thornton, Jonathan C. Osborne
- 8. Missing Cat
Recurring: Ethan Murray (Preview Narrator)
Episodic: Dorothy Melendrez (Louise Ferry), Tom Charles (Eugene Grant)
Incidental: Gary Michaels (Cop 1)
Additional Voices: Frank Buck, Jim Taggert, Jonathan C. Osborne, Mathew Austin, Matt 'Masamune' Miller, Penny Sweet, Phil Swell, Rafael Antonio Oliver
- 9. Beck Comes Back
Recurring: Ethan Murray (Preview Narrator)
Episodic: Gully Jimson (Mr. Wise), Robert Wicks (Beck Gold)
Additional Voices: Frank Buck, Gary Michaels, Jim Slade, Jim Taggert, Jonathan C. Osborne, Mathew Austin, Matt 'Masamune' Miller, Penny Sweet, Phil Swell, Rafael Antonio Oliver
- 10. Winter Night Phantom
Recurring: Alfred Thor (Alex Rosewater), Ethan Murray (Preview Narrator)
Episodic: Jeremiah Freedman (Cop), Mona Marshall (Winter Night Phantom)
Incidental: Sam Strong (Forensics)
Additional Voices: Debbie Rothstein, Frank Buck, Gary Michaels, Jessica Gee, Jim Slade, Jim Taggert, Jonathan C. Osborne, Mathew Austin, Matt 'Masamune' Miller, Penny Sweet, Phil Swell, Rafael Antonio Oliver, W.T. Hatch
- 11. Daemonseed
Recurring: Alfred Thor (Alex Rosewater), Ethan Murray (Preview Narrator)
Episodic: Michelle Ruff (Laura), Steve Areno (Oliver)
Additional Voices: Frank Buck, Gary Michaels, Jessica Gee, Jim Slade, Jim Taggert, Jonathan C. Osborne, Mathew Austin, Matt 'Masamune' Miller, Phil Swell, W.T. Hatch
- 12. Enemy is Another Big
Recurring: Alfred Thor (Alex Rosewater), Ethan Murray (Preview Narrator)
Episodic: Ivan Buckley (Party Host), Jonathan C. Osborne (Party Guest), Michael McConnohie (Michael Seebach / Schwartzvald)
Additional Voices: Frank Buck, Gary Michaels, Jessica Gee, Jim Slade, Jim Taggert, Jonathan C. Osborne, Mathew Austin, Matt 'Masamune' Miller, Phil Swell
- 13. R·D
Recurring: Alfred Thor (Alex Rosewater)
Episodic: Lia Sargent (R·D), Michael McConnohie (Michael Seebach / Schwartzvald), William Knight (Gordon Rosewater)
Additional Voices: Frank Buck, Gary Michaels, Jessica Gee, Jim Slade, Jim Taggert, Jonathan C. Osborne, Mathew Austin, Matt 'Masamune' Miller, Phil Swell