Yuri Lowenthal
Ben Tennyson (voice)
Ashley Johnson
Gwen Tennyson (voice)
Greg Cipes
Kevin Levin (voice)
Dee Bradley Baker
Humungosaur (voice)
John DiMaggio
Aggregor (voice)
Jeff Bennett
Azmuth (voice)
Vyvan Pham
Julie Yamamoto / Computer Voice (voice)
Paul Eiding
Max Tennyson / Guard #1 / Guard #2 (voice)
Peter Renaday
Sir George (voice)
Scott Menville
Jimmy Jones (voice)
Juliet Landau
Natalie Tennyson / Melinda (voice)
James Remar
Vilgax (voice)
Alexander Polinsky
Argit (voice)
Kari Wahlgren
Charmcaster (voice)
Fred Tatasciore
Staradisimus / Forever Knight #3 (voice)
Rob Paulsen
Technician / Rhomboid Vreedle / Engineer #2 (voice)
David McCallum
Professor Paradox (voice)
Dwight Schultz
Dr. Animo / Teacher #2 (voice)
Wil Wheaton
Mike Morningstar / Darkstar (voice)
Patrick Cavanaugh
Winston / Esoterica / Additional Voices (voice)
Chris Pratt
Cooper (voice)
Greg Ellis
Prince Gyula / Cyborg #2 (voice)
Peter MacNicol
Oliver / Forever Knight #1 (voice)
Kevin Michael Richardson
Magister Pyke (voice)
Jason Marsden
Antonio (voice)
James Arnold Taylor
Plumber Officer / Brannigan / Kolar (voice)
Molly C. Quinn
Eunice / Computer (voice)
Tia Texada
Elena Validus (voice)
Robin Atkin Downes
Sir Cyrus / Additional Voices (voice)
Richard Doyle
Driscoll / Additional Voices (voice)
Christopher McDonald
Captain Nemesis (voice)
Tara Platt
Jennifer Nocturne (voice)
Zeno Robinson
Alan Albright / Heatblast (voice)
Sean Donnellan
Ben 10,000 / Eon (voice)
Powers Boothe
Sunder (voice)
Peter Stormare
King Xarion / King Viktor (voice)
Beth Littleford
Sandra Tennyson (voice)
J.K. Simmons
Magister Gilhil / Plumber (voice)
Nicholas Guest
Simons / Worker / Guest (voice)
Matt Levin
Cash (voice)
