- Hypothetical Casting: Each chapter ends with voice actors for each character. Most of the cast retain their normal voice actors, with some exceptions.
- Ben Tennyson (17-years-old)/Albedo/Feedback: Yuri Lowenthal
- Ben Tennyson (10-years-old): Tara Strong
- Lucario (Lucario): Sean Schemmel
- Lucario (Riolu): Stephanie Nadolny
- Professor Paradox: David McCallum
- Heatblast (17-years-old): Steve Blum
- Heatblast (10-years-old): Steve Blum
- Ghostfreak: Steve Blum
- Azmuth: Jeff Bennett
- Kevin (present): Greg Cipes
- Bass: Clancy Brown
- Treble: Phil LaMarr
- Gutrot/Magister Patelliday/Chadzmuth/Rhomboid Vreedle/Ditto: Rob Paulsen
- Most of Ben's aliens: Dee Bradley Baker
- "Lord" Decibel: David Kaye
- Lady Decibel/Christine Nocturne: Tara Strong
- L.Y.R.A.: Jessica Strauss
- Dialga: Gary Oldman
- Julie Yamamoto/Ship: Vyvan Pham
- Max Tennyson/Oso/Oculus: Paul Eiding
- Robucket: Macintalk (Fred)
- Judge Domstol/Rath/Octagon Vreedle: John DiMaggio
- Elena Validus/Nanochip Queen: Tia Texada
- Sandra Tennyson: Beth Littleford
- Arceus: Tom Wayland
- Ho-Oh: Bruce Davison
- Xerneas: Nicole Oliver
- K8-E: Lindsay Jones
- Corvo/Parry Vreedle: Bumper Robinson
- Jewelry Store Clerk: Jim Byrnes
- Fistrick: Eric Bauza
- León: Dee Bradley Baker
- XLR8: Josh Keaton
- The Original Darrin: Heatblast is "reprised" by Steve Blum (his voice actor from the original series) instead of David Kaye (who did both teen and 10 year old Heatblast in Omniverse). Likewise, Azmuth is "reprised" by Jeff Bennett instead of Rene Auberjonois. Arceus is "reprised" by Tom Wayland, his voice actor from Pokémon: Arceus and the Jewel of Life instead of Marc Thompson who did the role in Pokémon: Hoopa and the Clash of Ages.
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