| Episode credited cast: |
 | Pamela Adlon | - | Rusty, the Boy Robot / Jo (voice) (as Pam Siegal) |
 | Jonathan David Cook | - | Big Guy (voice) |
 | Jim Hanks | - | Dwayne Hunter (voice) |
 | Gabrielle Carteris | - | Dr. Erika Slate (voice) |
 | Stephen Root | - | Dr. Donovan (voice) |
 | Kathy Kinney | - | Jenny the Monkey (voice) (as Kathryn Kinney) |
| Rest of cast listed alphabetically: |
 | Clancy Brown | - | Legion Ex Machina 1-5 (voice) |
 | R. Lee Ermey | - | General Thorton (voice) |
 | Kevin Michael Richardson | - | Garth (voice) (as Kevin Richardson) |
 | M. Emmet Walsh | - | Mack (voice) |
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