Also known as: アルティメットエイリアン
Sequel to Ben 10: Alien Force, set weeks after the events of that show's finale, and featuring the usage of the Ultimatrix.
Characters
Main
Ben's aliens
- Alien X (Ben 10)
- Bellicus
- Serena (Ben 10)
- Ampfibian (Ben 10)
- Armodrillo
- Big Chill
- Ultimate Big Chill
- Brainstorm (Ben 10)
- Cannonbolt
- Chamalien
- Chromastone
- Clockwork (Ben 10)
- Diamondhead
- Eatle (Ben 10)
- Echo Echo (Ben 10)
- Ultimate Echo Echo
- Fasttrack (Ben 10)
- Feedback (Ben 10)
- Four Arms (Ben 10)
- Ghostfreak
- Goop (Ben 10)
- Heatblast
- Humungousaur
- Ultimate Humungousaur
- Jetray
- Juryrigg
- Lodestar (Ben 10)
- Nanomech (Ben 10)
- NRG (Ben 10)
- Rath (Ben 10)
- Ripjaws
- Shocksquatch (Ben 10/Generator Rex: Heroes United)
- Spidermonkey
- Ultimate Spidermonkey
- Stinkfly
- Swampfire
- Ultimate Swampfire
- Terraspin
- Tetrax
- Upchuck
- Murk Upchuck
- Waterhazard (Ben 10)
- Way Big
- Wildmutt
Others
- Aggregor
- Argit
- Albedo (Ben 10)
- Captain Nemesis
- Charmcaster
- Dr. Animo
- Dr. Victor Valadis
- DNAliens
- Eunice (Ben 10)
- Hex (Ben 10)
- Highbreed (Ben 10)
- Lucubra
- Max Tennyson
- Michael Morningstar
- Microchips (Ben 10)
- Mutant Frogs
- P'Andor (Ben 10)
- Pickaxe Alien (Ben 10)s
- Rock Monsters (Ben 10)
- Rojo (Ben 10)
- Ship (Ben 10)
- Sir Driscoll
- Sunder (Ben 10)
- Vilgax