- Dee Bradley Baker - Stinkfly / Wildmutt (voice)
- Dee Bradley Baker - Wildmutt / Bullie #1 / Robotic Lt. (voice)
- Fred Tatasciore - Cannonbolt (voice)
- Fred Tatasciore - Cannonbolt / Ripjaws (voice)
- Fred Tatasciore - Ripjaws (voice)
- Fred Tatasciore - Ripjaws / Krakken (voice)
- Robert Patrick - Phil (voice)
- Charlie Schlatter - Kevin Levin (voice)
- Michael Reisz - Kevin Levin (voice)
- Nolan North - Teen Attendant / Henchman (voice)
- Rosalind Chao - Councilwoman Liang (voice)
- Cree Summer - Frightwig (voice)
- Miriam Flynn - Aunt Vera (voice)
- Jeff Doucette - Thumbskull (voice)
- John Kassir - Zombozo (voice)
- Larry Cedar - Howell (voice)
- Nicholas Guest - Clancy (voice)
- Robin Atkin Downes - Jonah (voice)
- Billy West - Kraab (voice)
- Billy West - Guard / Punk #2 (voice)
- Dwight Schultz - Dr. Animo (voice)
- Dwight Schultz - Earl (voice)
- Walker Edmiston - Marty (voice)
- Dave Fennoy - Radio Newscaster / Doctor (voice)
- Dave Fennoy - Hoverboard (voice)
- Mikey Kelley - Gang #2 / Attendant / Helicopter Pilot (voice)
- Jennifer Hale - Gilbert / Mandy (voice)
- Jennifer Hale - Teacher / Jamie (voice)
- Jennifer Hale - Joey (Rojo) (voice)
- Nancy Linari - Tour Guide / Reporter / Screaming Woman (voice)
- Nancy Linari - Automated Voice (voice)
- Robert Picardo - Leader Alien (voice)
- James C. Mathis III - Enforcer Alien (voice)
- Michael Gough - Lt. Steel (voice)
- Bill Ratner - The Seer (voice)
- Kari Wahlgren - Charmcaster (voice)
- Kari Wahlgren - Grey Matter Gwen (voice)
- Jack Angel - Technorg (voice)
- Armin Shimerman - Slix (voice)
- Greg Ellis - Synaptak (voice)
- Adam Wylie - Bullie #2 (voice)
- Adam Wylie - JT (voice)
- John DiMaggio - Vulkanus (voice)
- Richard Doyle - Enoch (voice)
- Richard Doyle - Mr. Jingles (voice)
- Richard Doyle - Dr. Shueman (voice)
- Vanessa Marshall - Female Cannonbolt / Policewoman (voice)
- Vanessa Marshall - Diamond Head Gwen / Four Arms Gwen (voice)
- Vanessa Marshall - Tini (voice)
- Khary Payton - Hex (voice)
- Khary Payton - Convict #1 (voice)
- Khary Payton - Foreman / Forever Knight #1 (voice)
- Khary Payton - Automated Voice (voice)
- Khary Payton - Teen #1 (voice)
- Tom Kane - Ultimos (voice)
- Tom Kane - Donovan (voice)
- Patricia Lentz - Mildred / Gypsy (voice)
- Kim Mai Guest - Andy (voice)
- Kim Mai Guest - Elsgood / Grandkid / Kid #1 (voice)
- Kim Mai Guest - Pinky / Kid (voice)
- Grey DeLisle - Heatblast Gwen (voice)
- Grey DeLisle - Xylene (voice)
- Kath Soucie - Joan / Teen #2 / Cowgirl (voice)
- Kath Soucie - Edwin (voice)
- Kath Soucie - Little Boy / Tiffany (voice)
- Miguel Nájera - Wes (voice)
- Bettina Bush - Kai (voice)
- Keone Young - Ishyama (voice)
- Clancy Brown - Kenko (voice)
- Josh Keaton - Dean (voice)
- Dave Wittenberg - Harold / Escape Artist / Emcee (voice)
- Dave Wittenberg - Upchuck (voice)
- John Cygan - Abel North (Kangaroo Commando) / Kane North (voice)
- Rob Pinkston - Todd (voice)
- Jess Harnell - Band Member #1 / Announcer (voice)
- Marc Thompson - Vance (voice)
- Michael Dorn - Vicktor (voice)
- Richard Green - Benmummy (voice)
- Steven T. Seagle
- Joe Casey
- Marsha Griffin
- Eugene Son
- Duncan Rouleau
- Sam Register
Michael Dorn interpreta a Vicktor (voice) en la serie.
Robert Patrick hace el papel de Phil (voice).
Greg Ellis interpreta a Synaptak (voice) en la serie.
Michael Gough interpreta a Lt. Steel (voice) en la serie.
Tara Strong interpreta a Ben Tennyson (voice) en la serie.
Meagan Moore interpreta a Gwen Tennyson (voice) en la serie.
Paul Eiding interpreta a Grandpa Max (voice) en la serie.
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