Ben 10: Hero of All Ages/Antagonist


 * Eon-Sean Donnellan
 * Limax

Dimension 12 Robots

 * Computron
 * Robots

Jadan's Gang

 * Jadan-Arnold Schwarzenegger


 * Gertrude Tate-Anne Hathaway
 * Vilgax-Steven Jay Blum


 * Psyphon-Eric Bauza


 * Fistina-Morgan Lofting


 * Bubble Helmet-Jon Polito
 * Dr. Stagnog-Greg Cipes


 * Liam-Paul Eiding


 * Animo-Dwight Schutz


 * Cincursius-Steve Blum
 * Exo-Skull-Richard McGongle
 * Kraab-Billy West


 * Thunderpig-Jeff Bennet


 * Dummyhead/Tummyhead (Deceased)-Matt Wayne (Dummyhead) Kevin Micheal Richardson (Tummyhead)


 * Aggregor (Deceased)-John DiMaggio


 * Two Face Tennyson (Deceased)-Tara Strong

Rista's Group

 * Rista-Tom Hardy


 * Fick Marts-Marton Csokas


 * Alissa Rutells-Penelope Cruz


 * John Darklom-Jackson Rathbone


 * Carl Nesmith-Cillian Murphy


 * Jennifer Nocturne-Kristen Stewart


 * Liza Encloffen-Ashley Greene


 * Brannigen-Tobey Maguire


 * Drench Boyton-Williem Dafoe


 * Fangblade Army

​Malware's Army

 * Malware-Corey Burton


 * Albedo-Judd Nelson
 * Malwarette-Elizabeth Banks
 * Imperial-James Franco
 * Reboot-Randy Savage
 * Trooper-Larry Joshua


 * Darkstar (Deceased)-Jason Padgett


 * Howler (Deceased)-Evan Arnold


 * Ricknot (Deceased)-David Holcomb


 * Fedgemen (Deceased)-Myk Wattford


 * Calcora (Deceased)-Shia LeBouf

Khyber's Huntsmen

 * Khyber-Sam Worthington


 * Khyber's Pet-Dee Bradley Baker


 * Fistrick-Stephen Lang


 * Corvo-Giovanni Ribisi


 * Hoodlum-Joel David Moore
 * Trumbipulor-Wes Studi
 * Ssserpent-Ben Affleck

The Vreedles

 * Octagon-Jerry Seinfield


 * Rhomboid-Zach Galifianakis


 * Pops-Bradley Cooper


 * Ma-Jamie Chung


 * Pretty Boy-Mike Tyson

Halloween Task Force

 * Zs'Skayr-Ken Jeong


 * Zombozo-Ed Helms


 * King Viktor-Justin Bartha


 * Acid Breath (Deceased)-Dee Bradley Baker


 * Frightwig (Deceased)-Sasha Barrese


 * Thumb Skull (Deceased)-Mr. T


 * Yelandooshi


 * Mummy (Deceased)-Jeffrey Tambor

The Redwind Warlords

 * Warlord Gar-Paul Giamatti


 * Princess Looma-Gillian Vigman


 * Prince Bron-Nick Cassavetes
 * Princess Zantanna-Heather Graham
 * Princess Taya-Miranda Nolan

The Mad Scientists

 * Dr. Pyschobos-Chris Ellis


 * Cansted-Reggie Lee


 * Richnee-Duane Henry


 * Daloop-James Harvey Ward


 * Jeckard-Lex Daniel


 * Tammible-Gary Oldman

The Flourana Hippies

 * Pax-Christian Bale
 * Flouranas

The Chalybeas Speedster
Have not appeared yet

The Incursions

 * Incursion Naval Fleet
 * Emperor Milleous-Tom Hardy
 * Froggo-Morgan Freeman
 * Attea-Marion Cotillard
 * Tadlet-Micheal Caine
 * Reptilian-Matthew Modine
 * Ruppit-Cillian Murphy
 * Froglic-John DiMaggio
 * Raff-David Gyasi
 * Sang Froid-Joey King

The Billions

 * Billy Billions-Jack Ryder
 * Mazuma-Ashley Johnson

Miners

 * Vulkanus-John DiMaggio
 * Pickaxe Aliens

Villains Unconfirmed To Appear But Have Done So In BTHOAA

 * Vulkanus


 * Rojo


 * Simian


 * Clancy


 * Sixsix


 * Sevenseven


 * Nanochips


 * Elena


 * Kolar


 * Roar


 * Argit