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Humungousaur is the Omnitrix's DNA sample of a Vaxasaurian from the planet Terradino.

Appearance
Humungousaur is approximately 12 feet tall. His body is somewhat humanoid and muscular with two arms and two legs. His legs are shorter than his arms. He has elephant-like feet and a lengthly lizard-like tail. His armored hide is light brown, with minor plating on his shoulders, tail, back, arms, and upper legs. He has a beige chest, abs, inner arms, and lower jaw. Dark grey, stone-like spikes, each shaped like the dorsal fin of a shark, run down his spine from the top of his neck to a black mace on the end of his tail. The mace has three spikes shaped like stalagmites, being one large spike on the middle and two smaller spikes on the sides. He has three fingers and a thumb on each hand and three black, elephant-like toes on each foot. His knee caps and finger joints also bulge out.

His square-like head is mostly hunched forward and the beige area of his neck is wrinkled. Both his lower jaw and brows are protruding while his almost human-like nose appears to be squished inward. His lips are black and have wrinkles. His teeth are yellowed and minorly fanged. He also has two green eyes with thick black outlines.

Humungousaur wears the Omnitrix symbol on his chest.

Powers and Abilities
Humungousaur possesses incredible strength.

He possesses a thick, armored hide, which has proven to be durable enough to withstand blaster fire and heavy impacts.

Humungousaur's tail is powerful enough to create shockwaves when he slams it against the ground.

Weaknesses
Humungousaur's tail can cause unintentional damage if he doesn't watch what it hits. His large size also means he's slow, is an easy target and can't fit in tight spaces.

Humungousaur can't use his sonic attacks on soft surfaces such as mud.

History

 * In Innervasion Part 5: High Override, Humungousaur was added to the active playlist due to the Omnitrix's reboot.
 * In This One Goes to 11, Humungousaur defeated Wreckingbolt.
 * In Moor Fogg, Humungousaur battled the Fogg monster, but timed out.
 * In King of the Castle, Humungousaur stopped a chandelier from falling on him and the others.
 * In Bridge Out, Humungousaur helped Simon move some cars.
 * In Show Don't Tell, Humungousaur battled Hex and broke a spell he casted on Gwen.
 * In Don't Touch, Humungousaur battled the Forever Knight.
 * In Billy Bajillions, Humungousaur helped the Forgeti remove the snow.
 * In Cyber Slammers, Humungousaur battled Steam Smythe and accidentally wrecked the Biggie Box store.
 * In Franken-Fight, Humungousaur was briefly seen in video footage battling Wreckingbolt. He later battled Crystal Fist until he got distracted and scared by the tentacle shapes that he created.
 * In Buggin' the Buggs, Humungousaur attempted to fight Sydney and Maurice and accidentally wrecked the spa.
 * In Introducing Kevin 11, Humungousaur convinced Bashmouth to help save people.
 * In Which Watch, Humungousaur defeated Monster Kevin.

Season 3

 * This One Goes to 11 (first appearance)
 * Moor Fogg
 * King of the Castle
 * Show Don't Tell
 * Don't Touch
 * Bridge Out
 * Billy Bajillions
 * Cyber Slammers
 * Franken-Fight (x2, first time was video footage)
 * Buggin' the Buggs
 * Introducing Kevin 11
 * Which Watch
 * Lickety Split (cameo)
 * The Claws of the Cat

Trivia

 * Humungousaur was first revealed to appear in the reboot on the packaging for the season 3 Omnitrix toy.
 * The black spiked ball on the end of his tail is a reference to Ultimate Humungousaur of the classic continuity.
 * Humungousaur replaces Wildvine.
 * Humungousaur's name was given to him by an unnamed female toddler. Other names considered by Ben include Gigantigecko, Iguana Monster, Roar Thing and Mega-Stega Dude.
 * Humungousaur is the second alien from Ben 10: Alien Force to appear in the reboot and be used by young Ben, the first one being Rath.
 * Humungousaur's back spikes pay homage to the Kaiju Godzilla from the Toho Monster series.
 * Like many abnormally sized objects and characters in animation, | Humungosaur's size may vary with the needs of the story or scene; on one occasion he was large enough to tuck cars under his arms, while a short time later he was visibly smaller.