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1 Confirmed to Exist
1.1 Snakepit
1.2 Sandbox
1.3 Shellhead
1.4 Rocks
1.5 Squidstrictor
1.6 Thriller Whale
1.7 Somnambulizard
1.8 Skidmarx
1.9 Bungee Sponge
1.10 Portaler
1.11 Ventrilosquid
1.12 Decagon Vreedle
1.13 Charcoal Man
1.14 Dog-Nabbit
1.15 Giant Manster
1.16 Mr. Mucky
1.17 Copy Copy
1.18 Muck Amuck
1.19 Alien XXIII
1.20 Rath (Dimension 23)
1.21 Teeny Weeny
1.22 Fastcat
1.23 Windy-Hindy
1.24 Plug Man
1.25 Orbit Man
1.26 The Worst (Dimension 23)
2 Aliens introduced in Ben 10: Total Access
2.1 Bob the Blob
2.2 Plantapocalypse
2.3 Antigravitesla
3 Aliens introduced in Ben 10
3.1 Heatblast
3.1.1 Omni-Enhanced Heatblast
3.2 Wildmutt
3.2.1 Ultimate Wildmutt
3.3 Diamondhead
3.4 XLR8
3.4.1 Omni-Enhanced XLR8
3.5 Grey Matter
3.5.1 Omni-Enhanced Grey Matter
3.6 Four Arms
3.6.1 Handy Man
3.6.1.1 Omni-Enhanced Four Arms
3.7 Stinkfly
3.7.1 Big Bug
3.7.1.1 Omni-Enhanced Stinkfly
3.8 Ripjaws
3.9 Upgrade
3.9.1 Techno-Bubble
3.10 Ghostfreak
3.11 Cannonbolt
3.11.1 Ultimate Cannonbolt
3.11.1.1 Rollaway
3.11.1.2 Omni-Enhanced Cannonbolt
3.12 Wildvine
3.12.1 Omni-Enhanced Wildvine
3.13 Stink Arms
3.14 Diamond Matter
3.15 Heat Jaws
3.16 Spitter
3.17 Buzzshock
3.18 Articguana
3.18.1 Ultimate Articguana
3.18.1.1 Freezelizard
3.19 Blitzwolfer
3.20 Snare-oh
3.21 Frankenstrike
3.21.1 Lightning Volt
3.22 Upchuck
3.22.1 Vomit Man
3.23 Ditto
3.24 Eye Guy
3.24.1 Eye Guy (Dimension 23)
3.25 Way Big
3.25.1 Ultimate Way Big
3.26 Eon
4 Aliens introduced in Ben 10: Alien Force
4.1 Swampfire
4.1.1 Ultimate Swampfire
4.2 Echo Echo
4.2.1 Ultimate Echo Echo
4.3 Humungousaur
4.3.1 Ultimate Humungousaur
4.3.2 Dino-Mighty
4.4 Jetray
4.5 Big Chill
4.5.1 Ultimate Big Chill
4.5.2 Freezeghost
4.6 Chromastone
4.7 Brainstorm
4.8 Spidermonkey
4.8.1 Ultimate Spidermonkey
4.8.2 Mr. Monkey
4.9 Goop
4.10 Alien X
4.11 Lodestar
4.12 Rath
4.12.1 Ultimate Rath
4.13 Nanomech
5 Aliens introduced in Ben 10: Ultimate Alien
5.1 Water Hazard
5.2 AmpFibian
5.3 Armodrillo
5.3.1 Toolboxx
5.4 Terraspin
5.5 NRG
5.6 Fasttrack
5.7 ChamAlien
5.8 Eatle
5.9 Clockwork
5.10 Jury Rigg
5.11 Shocksquatch
5.11.1 Electricyeti
6 Aliens introduced in Ben 10: Omniverse
6.1 Feedback
6.2 Bloxx
6.2.1 Build-A-Guy
6.3 Gravattack
6.3.1 Ultimate Gravattack
6.4 Crashhopper
6.5 Ball Weevil
6.6 Walkatrout
6.7 Pesky Dust
6.7.1 Nighty Knight
6.8 Mole-Stache
6.9 The Worst
6.10 Kickin Hawk
6.11 Toepick
6.12 Astrodactyl
6.13 Bullfrag
6.14 Atomix
6.15 Fourmungousaur
6.16 Atomic-X
6.17 Crashocker
6.18 UpRigg
6.19 Big Chuck
6.20 Humungoopsaur
6.21 Gutrot
6.22 Whampire
7 Aliens introduced in Ben 10 (Reboot)
7.1 Overflow
7.1.1 Omni-Enhanced Overflow
7.2 Grey Arms
7.3 Amalgam Ben
7.4 Gax
7.5 Shock Rock