Ben 10 Ultimate Alien Force Aliens
10 year-old Ben Aliens
Heatblast - Wildmutt - Diamondhead - XLR8 - Grey Matter - Four Arms - Stinkfly - Ripjaws - Upgrade - Ghostfreak - Cannonbolt - Wildvine - Blitzwolfer - Snare-oh - Frankenstrike - Upchuck - Ditto - Eye Guy - Way Big - Feedback - Clockwork - Articguana
Alternative Future Aliens (Ben 10)
Spitter - Buzzshock
15-year-old Aliens
Swampfire - Echo Echo - Humungousaur - Jetray - Big Chill - Chromastone - Brainstorm - Spidermonkey - Goop - Alien X - Lodestar - Nanomech - Rath
16-year-old New Aliens
Water Hazard - AmpFibian - Armodrillo - Terraspin - NRG - Fasttrack - ChamAlien - Shocksquatch - Eatle - Jury Rigg - Bloxx - Gravattack - Crashhopper - Ball Weevil - Walkatrout - Pesky Dust - Molestache - The Worst - Kickin Hawk - Toepick - Astrodactyl - Bullfrag
Ultimate Forms
Ultimate Swampfire - Ultimate Spidermonkey - Ultimate Big Chill - Ultimate Humungousaur - Ultimate Cannonbolt - Ultimate Echo Echo - Ultimate Wildmutt - Ultimate Way Big - Ultimate Ben (Possible Future)
Mentioned only and Power Of The Omnitrix Aliens
Atomix - Snakepit - Sandbox - Shellhead - Rocks - Squidstrictor
Fusion Aliens
Stink Arms - Diamond Matter - Heat Jaws
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