Ben 10: Ultimate Alien

Yuri Lowenthal

Ben Tennyson (voice) (52 episodes)

Ashley Johnson

Gwen Tennyson (voice) (52 episodes)

Greg Cipes

Kevin Levin (voice) (52 episodes)

Dee Bradley Baker

Humungosaur (voice) (52 episodes)

John DiMaggio

Aggregor (voice) (5 episodes), Vulkanus / Rath (voice) (4 episodes), Will Harangue / Octagon Vreedle (voice) (3 episodes), Diagon (voice) (3 episodes), Rath / Conduit Edwards / Diagon (voice) (2 episodes), Will Harangue / Rath (voice) (1 episode), Forever Knight #2 / Rath / TV Reporter (voice) (1 episode), Trash Monster / Colonel Rozum / Additional Voices (voice) (1 episode), Swamps / Rath Albedo / V.O. Announcer (voice) (1 episode), Spellbinder / Addwaitya / Diagon (voice) (1 episode), Young Four Arms / Aggregor (voice) (1 episode), Addwaitya / Aggregor / Faint Voice (voice) (1 episode), Audience Member / Will Harangue / Rath (voice) (1 episode), Ultimate Aggregor / Volann Commander (voice) (1 episode), Magister Coronach / Octagon Vreedle (voice) (1 episode), Foreverduke838 (voice) (1 episode), Conduit Edwards / Carnival Barker (voice) (1 episode), Plumber / Aggregor (voice) (1 episode)

Vyvan Pham

Julie Yamamoto / Computer Voice (voice) (5 episodes), Julie Yamamoto / Ship (voice) (2 episodes), Julie Yamamoto (voice) (2 episodes), Erin / Julie Yamamoto (voice) (1 episode), Mrs. Jones (voice) (1 episode)

Jeff Bennett

Azmuth (voice) (8 episodes), Pops Vreedle / Jailer (voice) (1 episode), Major Domo / Hugh (voice) (1 episode), Magister Labrid / Major General (voice) (1 episode)

Paul Eiding

Max Tennyson / Guard #1 / Guard #2 (voice) (7 episodes)

Peter Renaday

Sir George (voice) (5 episodes), Old George (voice) (1 episode)

Scott Menville

Jimmy Jones (voice) (3 episodes), Jimmy / J.T. / Pilot 2 (voice) (1 episode), J.T. (voice) (1 episode)

James Remar

Vilgax (voice) (5 episodes)

Juliet Landau

Natalie Tennyson / Melinda (voice) (3 episodes), Fritz (voice) (1 episode), Verdona Tennyson / Waitress (voice) (1 episode)

Kari Wahlgren

Charmcaster (voice) (4 episodes)

Alexander Polinsky

Argit (voice) (4 episodes)

Patrick Cavanaugh

Winston / Esoterica / Additional Voices (voice) (3 episodes)

Wil Wheaton

Mike Morningstar / Darkstar (voice) (3 episodes)

Rob Paulsen

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

Fred Tatasciore

Quince / Robot Guard (voice) (1 episode), Staradisimus / Forever Knight #3 (voice) (1 episode), Foreman / Surgeon / Hammer (voice) (1 episode)

Dwight Schultz

Dr. Animo / Teacher #2 (voice) (2 episodes), Sheriff / Dr. Animo (voice) (1 episode)

David McCallum

Professor Paradox (voice) (3 episodes)

Greg Ellis

Prince Gyula / Cyborg #2 (voice) (1 episode), Dagonet / Reporter Chet Rigby (voice) (1 episode)

Peter MacNicol

Oliver / Forever Knight #1 (voice) (2 episodes)

Molly C. Quinn

Eunice / Computer (voice) (2 episodes)

Jason Marsden

Antonio (voice) (1 episode), Young Max Tennyson (voice) (1 episode)

Zeno Robinson

Alan Albright / Heatblast (voice) (2 episodes)

Kevin Michael Richardson

Kwarrel (voice) (1 episode), Magister Pyke (voice) (1 episode)

Robin Atkin Downes

Sir Cyrus / Additional Voices (voice) (2 episodes)

Richard Doyle

Driscoll / Additional Voices (voice) (2 episodes)

Tia Texada

Elena Validus (voice) (2 episodes)

Sean Donnellan

Cameraman / Thug / Tech (voice) (1 episode), Ben 10,000 / Eon (voice) (1 episode)

Christopher McDonald

Captain Nemesis (voice) (2 episodes)

Tara Platt

Jennifer Nocturne (voice) (2 episodes)

James Arnold Taylor

Announcer / Fake Vilgax / Fridge (voice) (1 episode), Plumber Officer / Brannigan / Kolar (voice) (1 episode)

Chris Pratt

Cooper (voice) (2 episodes)

Beth Littleford

Sandra Tennyson (voice) (1 episode)

Peter Stormare

King Xarion / King Viktor (voice) (1 episode)

Matt Levin

Cash (voice) (1 episode)

Powers Boothe

Sunder (voice) (1 episode)

Diedrich Bader

Simian (voice) (1 episode)

Jon Polito

Mizaru (voice) (1 episode)

Xander Berkeley

Warden Morgg / Trukk (voice) (1 episode)

Diane Delano

Ma Vreedle / Pretty Boy Vreedle (voice) (1 episode)

Tress MacNeille

Zennith (voice) (1 episode)

Tara Strong

Serena / Young Ben Tennyson (voice) (1 episode)

Brian George

Victor Valadis / Janitor (voice) (1 episode)

Nicholas Guest

Simons / Worker / Guest (voice) (1 episode)

Khary Payton

Hex (voice) (1 episode)

Olivia Hack

Emily (voice) (1 episode)

Marianne Muellerleile

Maureen (voice) (1 episode)

Danny Jacobs

Captain / Police Dispatch / Dr. Pervis (voice) (1 episode)

Bill Mumy

Agent Bryson (voice) (1 episode)

Vicki Lewis

Agent Locke (voice) (1 episode)

Yeni Alvarez

Dr. Borges (voice) (1 episode)

Keone Young

Julie's Dad / Repair Man / Cop (voice) (1 episode)

Adam Wylie

Pierce / Forever Knight #3 (voice) (1 episode)

J.K. Simmons

Magister Gilhil / Plumber (voice) (1 episode)

Jim Piddock

King Urien / Color Commentator / Chair Umpire (voice) (1 episode)

Miguel Ferrer

Magister Hulka / Alpha #4 (voice) (1 episode)

Charlie Schlatter

Tack / Plumber (voice) (1 episode)

Dan Riba

Director (19 episodes)

Matt Youngberg

Director (18 episodes)

Butch Lukic

Director (14 episodes)

Joe Casey

Writer (39 episodes)

Joe Kelly

Writer (32 episodes)

Len Uhley

Writer (9 episodes)

Duncan Rouleau

Writer (7 episodes)

Charlotte Fullerton

Writer (5 episodes)

Peter David

Writer (3 episodes)

Geoffrey Thorne

Writer (2 episodes)

Dwayne McDuffie

Writer (2 episodes)

Ernie Altbacker

Writer (2 episodes)

Marty Isenberg

Writer (2 episodes)

Eugene Son

Writer (1 episode)

Len Wein

Writer (1 episode)

Kevin Grevioux

Writer (1 episode)

Stan Berkowitz

Writer (1 episode)

Steven Barnes

Writer (1 episode)

David McDermott

Writer (1 episode)

Brian Swenlin

Writer (1 episode)

Matt Wayne

Writer (1 episode)

J. M. DeMatteis

Writer (1 episode)

Adam Beechen

Writer (1 episode)

Matt Youngberg

Writer (1 episode)