Ben 10: Ultimate Alien

Yuri Lowenthal

Ben Tennyson (voice)

Ashley Johnson

Gwen Tennyson (voice)

Greg Cipes

Kevin Levin (voice)

Dee Bradley Baker

Humungosaur (voice)

Wil Wheaton

Darkstar

Vyvan Pham

Julie Yamamoto

Jeff Bennett

Azmuth

Peter Renaday

Sir George

Paul Eiding

Grandpa Max

John DiMaggio

Addwaitya / Aggregor / Faint Voice (voice) / Aggregor (voice) / Audience Member / Will Harangue / Rath (voice) / Conduit Edwards / Carnival Barker (voice) / Diagon (voice) / Forever Knight #2 / Rath / TV Reporter (voice) / Foreverduke838 (voice) / Magiste

Scott Menville

J.T. (voice) / Jimmy / J.T. / Pilot 2 (voice) / Jimmy Jones (voice)

Juliet Landau

Fritz (voice) / Natalie Tennyson / Melinda (voice) / Verdona Tennyson / Waitress (voice)

James Remar

Vilgax (voice)

Alexander Polinsky

Argit (voice)

Kari Wahlgren

Charmcaster (voice)

Rob Paulsen

Baz-El / Forever Knight #1 / Churl #4 (voice) / Rhomboid Vreedle / Magister Patelliday (voice) / Technician / Rhomboid Vreedle / Engineer #2 (voice)

Fred Tatasciore

Foreman / Surgeon / Hammer (voice) / Quince / Robot Guard (voice) / Staradisimus / Forever Knight #3 (voice)

Dwight Schultz

Dr. Animo / Teacher #2 (voice) / Sheriff / Dr. Animo (voice)

David McCallum

Professor Paradox (voice)

Patrick Cavanaugh

Winston / Esoterica / Additional Voices (voice)

Chris Pratt

Cooper (voice)

Greg Ellis

Dagonet / Reporter Chet Rigby (voice) / Prince Gyula / Cyborg #2 (voice)

Sean Donnellan

Ben 10,000 / Eon (voice) / Cameraman / Thug / Tech (voice)

Peter MacNicol

Oliver / Forever Knight #1 (voice)

Kevin Michael Richardson

Kwarrel (voice) / Magister Pyke (voice)

Jason Marsden

Antonio (voice) / Young Max Tennyson (voice)

James Arnold Taylor

Announcer / Fake Vilgax / Fridge (voice) / 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) / Cameraman / Thug / Tech (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)

Tara Strong

Serena / Young Ben Tennyson (voice)

Xander Berkeley

Warden Morgg / Trukk (voice)

Brian George

Victor Valadis / Janitor (voice)

Miguel Ferrer

Magister Hulka / Alpha #4 (voice)

Charlie Schlatter

Tack / Plumber (voice)

Olivia Hack

Emily (voice)

Adam Wylie

Pierce / Forever Knight #3 (voice)

Diedrich Bader

Simian (voice)

Jon Polito

Mizaru (voice)

Keone Young

Julie's Dad / Repair Man / Cop (voice)

Yeni Alvarez

Dr. Borges (voice)

Bill Mumy

Agent Bryson (voice)

Vicki Lewis

Agent Locke (voice)

Diane Delano

Ma Vreedle / Pretty Boy Vreedle (voice)

Khary Payton

Hex (voice)

Marianne Muellerleile

Maureen (voice)

Danny Jacobs

Captain / Police Dispatch / Dr. Pervis (voice)

Jim Piddock

King Urien / Color Commentator / Chair Umpire (voice)

Tress MacNeille

Zennith (voice)