This is the list of aliens belongs to Len in the series Len 10. All aliens are parodied from Ben 10 aliens.
- Meatblast (Heatblast): He can control meat!
- Mildmutt (Wildmutt): Unlike Wildmutt, this guy is small, cute and fluffy.
- Diamondbread (Dimaondhead): He is indestructible, and he can shoot frozen hard bread.
- XN28 (XLR8): He can talk fast, do stuff fast, think too fast, but he can't run fast.
- Grey Splatter (Grey Matter): He is a grey splatter who is very smart.
- Onearm (Fourarms): Super strong, but only one hand.
- Stinkguy (Stinkfly): He is a weird dude with insect features, and he stinks.
- Lipjaws (Ripjaws): He is like Ripjaws with giant lips.
- Cupgrade (Upgrade): He can only upgrade furniture and silverware, and plates and cups.
- Toastfreak (Ghostfreak): Toasty powers!
Additional Ben 10
- Cannoncube (Cannonbolt): Can roll into a cube but is slow anyway.
- Wildsign (Wildvine): He is made of many signs instead of vines.
- Lengolf/Blitzgolfer (Benwolf): A wolf that has golf clubs as hands. He is an expert golf player.
- Lentummy (Benmummy): A fat sumo wrestler alien. He can shoot fat and has sumo powers.
- Lentracktor (Benvicktor)
- Upchuck Norris (Upchuck): Has all the Chuck Norris joke powers.
- Nose Guy (Eye Guy): He can shoot snot from every nose, and combine the noses!
- Neon (Eon)
- Buzzshocker (Buzzshock): Can give you a shock like a electric pranker.
- Way Pig (Way Big): A gigantic pig!
- Articguano (Articguana)
- Sitter (Spitter): Chairs!
- Knitto (Ditto): He can knit anything
- Nosepick (Toespick): Mentioned. Glen said he even grosses him out.
- Smellhead (Shellhead):Mentioned.
- Cakepit (Snakepit):Mentioned.
- Fatomix ( Atomix): Mentioned. Glen really wanted Fatomix though.
- Sandpox (Sandbox): Mentioned.
- Swamptire (Swampfire): He can regenerate, control plants, and shoot tires.
- Gecko Gecko (Echoecho)
- Humungoufour (Humungousaur):
- Debtpay (Jetray): He is a buisnessman that can drive you crazy!
- Big Cheese (Big Chill): CHEESEBREATH
- Aromastone (Chromastone): He is a rock that smells good.
- Mainstorm (Brainstorm): Mainstorm is so hipster he was Brainstorm before he was cool
- Spiderdonkey (Spidermonkey): Half Spider, half donkey
- Poop (Goop): Instead of goo, poo.
- Alien F (): Can bend reality with his 23 personalities!
Ultimate Alien additionals
- Fastquack (Fasttrack): Super speedy duck!
- Math (Rath): Mathematical nerd.
- Clockjerk (Clockwork): Can only show the time.
- Toadstar (Lodestar):
- Wheatle (Eatle): A shark made out of wheat.
- Nanospeck (Nanomech): Like Nanomech, but much smaller.
- ClamAlien (ChamAlien): A giant clam.
- Otter Hazard (Water Hazard)
- Terraspit (Terraspin): A turtle with expert spitting powers.
- FRG (NRG): A fridge guy.
- Armopillow (Armodrillo): Armodrillo with pillow armor!
- Lampfibian (AmpFibian): A jellyfish alien that makes normal light.
- Hopscotch (Shocksquatch): He can jump!
- Jury Duty (Jury RIgg): A lawyer alien with powers of solving casing.
- Ultimate Swamptire (Ult. Swampfire): Now shoots blue tires, and has tire bombs.
- Ultimate Gecko Gecko (Ult. Echo Echo)
- Ultimate Humungoufour (Ult. Humungousaur)
- Ultimate Dig Drill (Ult. Big Chill)
- Ultimate Spiderdonkey (Ult. Spidermonkey): Now he looks more like a mule than a donkey, and has super strenght
- Ultimate Cannoncube (Ult. Cannonbolt): Now has spikes on his cube mode.
- Ultimate Mildmutt (Ult. Wildmutt)
- Ultimate Len (Ult. Len)
- Maestrodactyl (Astrodactyl): An astrodactyl like alien that can fly and control classical music.
- Wall Weevil (Ball Weevil): A weevil thing that can create plasma walls.
- Soxx (Bloxx): A weird alien made out of socks that can shapeshift.
- Woolfrag (Bullfrag): A sheep with awesum glasses.
- Rashhopper (Crashhopper): A grasshopper like alien that can give people rash.
- Seedback (Feedback): He shoots seeds!
- Larvattack (Gravattack): He controls butterflies, catterpillars and larva.
- Putrot (Gutrot):
- Lickin Hawk (Kickin Hawk): Tongue Karate!
- Trollstache (Molestache): TROLOLOLO
- Pesky Rust (Pesky Dust): Controls rust and stuff.
- The Best (The Worst): The best alien.
- Nosepick (Toepick): If he shows his nose, everyone is running in terror.
- Talkatrout (Walkatrout): A TALKING FISH
- Dampire (Whampire):
Aliens who were fused in Dr. Animeo and the Mutant hay.
- MLN (LMN) Probably won't appear, but might have a page. He shoots disgusting melon juice.
- Toiletpaperdude (Paperboy): Probably won't appear, but might have a page.
- Meatstone (Heatstone): Probably won't appear, but might have a page. A fusion between Meatblast, and Armoastone
- Harlechin (Harlequin): Won't appear. Has a giant chin as a weapon.
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