cast
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Yuri Lowenthal
Ben Tennyson (voice)
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Ashley Johnson
Gwen Tennyson (voice)
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Greg Cipes
Kevin Levin (voice)
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Dee Bradley Baker
Humungosaur (voice)
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John DiMaggio
Aggregor (voice) / Vulkanus / Rath (voice) / Will Harangue / Octagon Vreedle (voice) / Diagon (voice) / Rath / Conduit Edwards / Diagon (voice) / Plumber / Aggregor (voice) / Spellbinder / Addwaitya / Diagon (voice) / Forever Knight #2 / Rath / TV Reporter (voice) / Trash Monster / Colonel Rozum / Additional Voices (voice) / Ultimate Aggregor / Volann Commander (voice) / Conduit Edwards / Carnival Barker (voice) / Swamps / Rath Albedo / V.O. Announcer (voice) / Addwaitya / Aggregor / Faint Voice (voice) / Audience Member / Will Harangue / Rath (voice) / Foreverduke838 (voice) / Will Harangue / Rath (voice) / Magister Coronach / Octagon Vreedle (voice) / Young Four Arms / Aggregor (voice)
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Jeff Bennett
Azmuth (voice) / Pops Vreedle / Jailer (voice) / Magister Labrid / Major General (voice) / Major Domo / Hugh (voice)
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Vyvan Pham
Julie Yamamoto / Computer Voice (voice) / Julie Yamamoto (voice) / Julie Yamamoto / Ship (voice) / Mrs. Jones (voice) / Erin / Julie Yamamoto (voice)
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Paul Eiding
Max Tennyson / Guard #1 / Guard #2 (voice)
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Peter Renaday
Sir George (voice) / Old George (voice)
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Scott Menville
Jimmy Jones (voice) / Jimmy / J.T. / Pilot 2 (voice) / J.T. (voice)
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Juliet Landau
Natalie Tennyson / Melinda (voice) / Verdona Tennyson / Waitress (voice) / Fritz (voice)
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James Remar
Vilgax (voice)
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Alexander Polinsky
Argit (voice)
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Kari Wahlgren
Charmcaster (voice)
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Fred Tatasciore
Quince / Robot Guard (voice) / Foreman / Surgeon / Hammer (voice) / Staradisimus / Forever Knight #3 (voice)
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Rob Paulsen
Technician / Rhomboid Vreedle / Engineer #2 (voice) / Rhomboid Vreedle / Magister Patelliday (voice) / Baz-El / Forever Knight #1 / Churl #4 (voice)
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David McCallum
Professor Paradox (voice)
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Dwight Schultz
Dr. Animo / Teacher #2 (voice) / Sheriff / Dr. Animo (voice)
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Wil Wheaton
Mike Morningstar / Darkstar (voice)
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Patrick Cavanaugh
Winston / Esoterica / Additional Voices (voice)
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Chris Pratt
Cooper (voice)
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Greg Ellis
Prince Gyula / Cyborg #2 (voice) / Dagonet / Reporter Chet Rigby (voice)
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Peter MacNicol
Oliver / Forever Knight #1 (voice)
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Kevin Michael Richardson
Kwarrel (voice) / Magister Pyke (voice)
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Jason Marsden
Young Max Tennyson (voice) / Antonio (voice)
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James Arnold Taylor
Plumber Officer / Brannigan / Kolar (voice) / Announcer / Fake Vilgax / Fridge (voice)
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Molly C. Quinn
Eunice / Computer (voice)
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Tia Texada
Elena Validus (voice)
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Robin Atkin Downes
Sir Cyrus / Additional Voices (voice)
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Richard Doyle
Driscoll / Additional Voices (voice)
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Christopher McDonald
Captain Nemesis (voice)
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Tara Platt
Jennifer Nocturne (voice)
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Zeno Robinson
Alan Albright / Heatblast (voice)
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Sean Donnellan
Cameraman / Thug / Tech (voice) / Ben 10,000 / Eon (voice)
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Powers Boothe
Sunder (voice)
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Peter Stormare
King Xarion / King Viktor (voice)
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Beth Littleford
Sandra Tennyson (voice)
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J.K. Simmons
Magister Gilhil / Plumber (voice)
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Nicholas Guest
Simons / Worker / Guest (voice)
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Matt Levin
Cash (voice)
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Tara Strong
Serena / Young Ben Tennyson (voice)
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Xander Berkeley
Warden Morgg / Trukk (voice)
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Brian George
Victor Valadis / Janitor (voice)
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Miguel Ferrer
Magister Hulka / Alpha #4 (voice)
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Charlie Schlatter
Tack / Plumber (voice)
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Olivia Hack
Emily (voice)
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Adam Wylie
Pierce / Forever Knight #3 (voice)
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Diedrich Bader
Simian (voice)
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Jon Polito
Mizaru (voice)
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Keone Young
Julie's Dad / Repair Man / Cop (voice)
- Yeni Alvarez Dr. Borges (voice)
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Bill Mumy
Agent Bryson (voice)
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Vicki Lewis
Agent Locke (voice)
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Diane Delano
Ma Vreedle / Pretty Boy Vreedle (voice)
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Khary Payton
Hex (voice)
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Marianne Muellerleile
Maureen (voice)
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Danny Jacobs
Captain / Police Dispatch / Dr. Pervis (voice)
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Jim Piddock
King Urien / Color Commentator / Chair Umpire (voice)
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Tress MacNeille
Zennith (voice)
