Humungousaur (Classic)

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

Ben as Humungousaur
Humungousaur is about 12 feet tall and can grow bigger at will, up to about 60 feet. When he grows, his dinosaur features become more pronounced, growing Stegosaur-like plates on his back, a crest on his forehead, and spikes on his tail. Also, on his shoulders three plates separate and grow, giving him a more ferocious look. His arms do something similar. His skin is hard, brown, and a sort of beige color and he has a somewhat humanoid body. Humungousaur wears the Omnitrix/Ultimatrix symbol on his chest.

In Heroes United, the plates on his chest end in spikes. He has spikes above his eyes.

In Omniverse, Humungousaur wears black briefs with a white waistband and a green sash across his chest containing the Omnitrix symbol. Humungousaur now has grey fingernails instead of brown, a slightly bigger chin, green eyes in the same hue of his sash, and his nose has shifted to his forehead.

Albedo as Negative Humungousaur
In Alien Force, Negative Humungousaur looks exactly like Humungousaur in Alien Force and Ultimate Alien but he has red eyes and his Ultimatrix symbol is red as well.

In Omniverse, Negative Humungousaur has a darker skin color and a red sash across his chest in the opposite direction as Ben's Humungousaur. His eyes are the same red as his sash.

Alpha as Humungousaur
Humungousaur has dark green skin and some horns and sharp teeth. He has red eyes and sharp teeth. The fake Ultimatrix symbol is on his chest and red lines are spread across his body. The fake Ultimatrix is red.

Powers and Abilities
Humungousaur possesses incredible strength. According to Eugene, Humungousaur is strong enough to lift Way Big. He is able to throw an object to up to a high altitude, even into near-earth orbit.

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

In Vilgax Attacks and Cosmic Destruction, Humungousaur can do a shoulder charge and make shockwaves by slamming the ground.

Humungousaur has the power to increase his own body size and mass. He can grow up to 60 feet. His strength increases as he grows.

Humungousaur can generate his stegosauride features (plates and spikes on spine) without changing size.

In the video game Ben 10: Alien Force, Humungousaur was shown to be immune to freezing.

Humungousaur is durable enough to survive in space for a few minutes.

Humungousaur's tail is powerful enough to knock away Malware's third form easily, as shown in Showdown: Part 2.

Humungousaur is quite agile for his size, as he could somersault onto one of the Forever Knights' battle horses in Eye of the Beholder, perform a slide tackle in Special Delivery and be able to evade attacks while jumping in Showdown: Part 2.

Humungousaur has a powerful roar, which he used to scare away some reporters as seen in Fame.

Weaknesses
Humungousaur's strength is useless against Tyrannopede's sheer weight, although he can lift it over his head for brief amount of time. He is also very slow and can't fit into small spaces. He is extremely vulnerable to electricity, and his size makes him a very easy target for enemy attacks.

Ben

 * Humungousaur first appeared in Ben 10 Returns: Part 2,
 * Humungousaur battled some DNAliens but was defeated by a Highbreed.
 * In All That Glitters,
 * Humungousaur stopped a bridge from collapsing.
 * In Max Out,
 * Humungousaur battled some DNAliens.
 * In Pier Pressure,
 * Humungousaur saved Baz-El from an exploding ship.
 * In Paradox,
 * Humungousaur saved Hugo from getting sucked into Paradox's time machine and changed the present.
 * In Be-Knighted,
 * Humungousaur scared Squire into telling him the truth of the Dragon.
 * In Darkstar Rising,
 * Humungousaur was defeated by Darkstar.
 * Later, he defeated Darkstar.
 * In Good Copy, Bad Copy,
 * Humungousaur battled Negative Jetray.
 * In Grounded,
 * Humungousaur saved Kevin from a Highbreed.
 * In Voided,
 * Humungousaur battled D'Void.
 * In Inside Man,
 * Humungousaur battled some DNAliens.
 * In Unearthed,
 * Humungousaur battled Tiny.
 * In War of the Worlds: Part 2,
 * Humungousaur broke himself, Azmuth, Gwen, and Kevin out of a prison on Augstaka.
 * In Vengeance of Vilgax: Part 2,
 * Humungousaur was defeated by Vilgax.
 * In Simple,
 * Humungousaur ended the debate of the red and blue teams.
 * In Vreedle, Vreedle,
 * Humungousaur showed Judge Domstol the Omnitrix's ability to turn Ben into aliens.
 * In Singlehanded,
 * Humungousaur battled Sunder twice.
 * In If All Else Fails,
 * Humungousaur failed to stop a Highbreed Tree Monster.
 * In Ghost Town,
 * Humungousaur battled an alien in a golf course.
 * In Busy Box,
 * Humungousaur battled the Naljian Destructor.
 * In The Secret of Chromastone,
 * Humungousaur battled Vilgax.
 * In Above and Beyond,
 * Humungousaur pretended to capture Grandpa Max.
 * Later, Humungousaur was thrown into space by the Plumbers' Helpers.
 * In The Final Battle: Part 1,
 * Humungousaur battled Negative Ultimate Humungousaur.
 * In Alien Swarm,
 * Humungousaur battled a big rock made of Nanochips.

Albedo

 * In Good Copy, Bad Copy,
 * Negative Humungousaur battled the Forever Knights.
 * Later, Negative Humungousaur battled Swampfire.
 * In The Final Battle: Part 1,
 * Negative Humungousaur revealed the Ultimatrix to Ben.

Azmuth

 * In Primus,
 * Humungousaur was defeated by Vilgax.

Ben

 * Humungousaur returned to Ultimate Alien in Fame,
 * ​Humungousaur scared some reporters away.
 * In Duped,
 * Sensitive Humungousaur battled the Forever Knights.
 * In Video Games,
 * Humungousaur was scanned by Oliver.
 * Later, Humungousaur failed to defeat the Stalker.
 * In Too Hot to Handle,
 * Humungousaur battled Surgeon before going Ultimate.
 * In Hero Time,
 * Humungousaur beats Captain Nemesis in a train throwing contest.
 * Later, Humungousaur goes Ultimate.
 * In Ultimate Aggregor,
 * Humungousaur failed to stop Aggregor from absorbing the five aliens.
 * In Map of Infinity,
 * Humungousaur was defeated by Ultimate Aggregor.
 * In Deep,
 * Humungousaur scared away some fish aliens while drowning.
 * In Where the Magic Happens,
 * Humungousaur was crystallized by Adwaita, so he goes Ultimate.
 * In Perplexahedron,
 * Humungousaur was hit by some lasers on the Perplexahedron.
 * Later, Humungousaur battled some guards.
 * In ...Nor Iron Bars a Cage,
 * Humungousaur accidentally inhaled some alien dream dust and attacked Gwen.
 * In The Enemy of My Enemy,
 * Humungousaur went Ultimate to battle Ultimate Kevin.
 * In Absolute Power: Part 1,
 * Humungousaur battled Vulkanus to find out about Ultimate Kevin's location.
 * In Eye of the Beholder,
 * Humungousaur battled the Forever Knights.
 * In The Big Story,
 * Clone Ben as Humungousaur failed to capture Jimmy.
 * In Girl Trouble,
 * Humungousaur battled Antonio before going Ultimate.
 * In Revenge of the Swarm,
 * In a dream, a tiny Humungousaur was defeated by a clone of Victor Validus.
 * In The Creature from Beyond,
 * Humungousaur battled Sir Cyrus.
 * In It's Not Easy Being Gwen,
 * Humungousaur battled Animo and his mutant frogs.
 * In Prisoner Number 775 is Missing,
 * Humungousaur battled Prisoner 775.
 * In The Ultimate Sacrifice,
 * Humungousaur battled a red robot before going Ultimate.
 * In Solitary Alignment,
 * Humungousaur is used twice to fight Sir George. The second time he goes Ultimate.
 * In Couples Retreat,
 * Humungousaur went Ultimate.
 * In Catch a Falling Star,
 * Humungousaur impressed Ms. Nocturne, so Gwen could get information from her.
 * In The Eggman Cometh,
 * Humungousaur broke into Dr. Animo's barn.
 * In The Ultimate Enemy: Part 1,
 * Humungousaur battled Vilgax and Gwen.
 * In The Ultimate Enemy: Part 2,
 * Humungousaur appeared in a flashback.

Gwen

 * In Inspector 13,
 * Humungousaur briefly appeared before she turned into Murk Upchuck.

Ben

 * In Of Predators and Prey: Part 2,
 * Humungousaur battled Mucilator, who then transformed into Tyrannopede, whom he failed to defeat.
 * In Outbreak,
 * Humungousaur defeated Rook in a training battle.
 * In Blukic and Driba Go to Mr. Smoothy's,
 * Humungousaur battled Trumbipulor.
 * In Malefactor,
 * Humungousaur was dunked in the Ben 10 dunk game by a kid.
 * Humungousaur battled Malware and saved a school bus.
 * Humungousaur picked up the wooden bell.
 * In Arrested Development,
 * Humungousaur battled Computron's Minions.
 * In Special Delivery,
 * Humungousaur fought some of his enemies in Undertown.
 * In Showdown: Part 1,
 * Humungousaur was used to help Pakmar with his barbecue truck. He and Rook were teleported to Galvan Mark II to battle Omnivoracious who transformed into Tyrannopede.
 * In Showdown: Part 2,
 * Humungousaur battled Malware.
 * In The Frogs of War: Part 1,
 * Humungousaur battled Milleous.
 * In Rules of Engagement,
 * Humungousaur failed to defeat Princess Looma.
 * In An American Benwolf in London,
 * Humungousaur tried to pull Excalibur out of the stone but failed.
 * Humungousaur then battled the Forever Knights.
 * In Stuck On You,
 * Humungousaur battled Khyber, as Tyrannopede, with the help of Skurd.
 * In A New Dawn,
 * Humungousaur appeared for a short time when Ben was cycling through his aliens.

Albedo

 * In The Ultimate Heist,
 * Negative Humungousaur battled Inspector 13.
 * Later, Negative Humungousaur went Ultimate.
 * In And Then There Were None,
 * Humungousaur was briefly seen when Albedo turned into Ultimate Humungousaur.

Specials

 * In Ben 10-Generator Rex: Heroes United,
 * Humungousaur came out of the inter-dimensional rift and battled Rex Salazar. He was then used by Alpha.

Appearances
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Ben

 * Ben 10 Returns: Part 2 (first appearance)
 * All That Glitters
 * Max Out
 * Pier Pressure
 * Paradox
 * Be-Knighted
 * Darkstar Rising (x2)
 * Good Copy, Bad Copy
 * Grounded
 * Voided
 * Inside Man
 * Unearthed
 * War of the Worlds: Part 2
 * Vengeance of Vilgax: Part 2
 * Simple
 * Vreedle, Vreedle
 * Singlehanded
 * If All Else Fails (accidental transformation; selected alien was Way Big)
 * Ghost Town
 * Busy Box
 * The Secret of Chromastone (with a cold; selected alien was Way Big)
 * Above and Beyond
 * The Final Battle: Part 1

Albedo

 * Good Copy, Bad Copy (x2)
 * The Final Battle: Part 1 (goes ultimate)

Azmuth

 * Primus

Bioids

 * The Final Battle: Part 2

Ben 10: Ultimate Alien

 * Fame (first re-appearance)
 * Duped
 * Video Games (x2)
 * Too Hot to Handle (goes ultimate)
 * Hero Time (x2; goes ultimate second time)
 * Ultimate Aggregor
 * Map of Infinity
 * Deep
 * Where the Magic Happens (goes ultimate)
 * Perplexahedron (selected alien was Chromastone)
 * ...Nor Iron Bars a Cage
 * The Enemy of My Enemy (goes ultimate)
 * Absolute Power: Part 1
 * Eye of the Beholder
 * Girl Trouble (goes ultimate)
 * Revenge of the Swarm (dream)
 * The Creature from Beyond
 * It's Not Easy Being Gwen
 * Prisoner Number 775 is Missing
 * The Ultimate Sacrifice
 * Solitary Alignment (2x)
 * Couples Retreat (goes ultimate)
 * Catch a Falling Star
 * The Eggman Cometh (cameo)
 * The Ultimate Enemy: Part 1
 * The Ultimate Enemy: Part 2 (flashback)

Plant Ben

 * The Big Story (used by Plant Ben)

Gwen

 * Inspector 13

Ben

 * Of Predators and Prey: Part 2 (first re-appearance)
 * Outbreak
 * Blukic and Driba Go to Mr. Smoothy's
 * Malefactor (x3)
 * Arrested Development
 * Special Delivery
 * Showdown: Part 1
 * Showdown: Part 2
 * The Frogs of War: Part 1
 * Rules of Engagement
 * An American Benwolf in London
 * Stuck On You
 * A New Dawn (cameo)

Albedo

 * The Ultimate Heist (x2)
 * And Then There Were None (cameo)

Movies

 * Ben 10: Alien Swarm

Specials

 * Ben 10-Generator Rex: Heroes United

Video Games

 * Ben 10: Alien Force (Video Game)
 * Ben 10 Alien Force: Vilgax Attacks
 * Ben 10 Alien Force: The Rise of Hex
 * Ben 10 Ultimate Alien: Cosmic Destruction}}

Ben 10: Alien Force

 * 4" Humungousaur (Alien Collection)
 * 4" Humungousaur (Defender)
 * 6" Humungousaur (DNA Alien)
 * Humungousaur (Deluxe)
 * Alien Creation Humungousaur
 * Humungousaur Alien Rock

Ben 10: Omniverse

 * 4" Humungousaur
 * 4" Translucent Humungousaur
 * Humungousaur Vinyl Figure
 * Mini figures Humungousaur & Jetray
 * Humungousaur (DNA Alien Figure)

Etymology
His name is a portmanteau of "Humongous," meaning "big," referencing his size, and "dinosaur."

Trivia

 * Humungousaur is the first alien used on screen by Albedo. He is also the first alien to be ultimatized on-screen (also by Albedo).
 * In Ben 10: Game Creator, Humungousaur's name is misspelled "Humongousaur".
 * Dwayne McDuffie and Derrick J. Wyatt have both said Dee Bradley Baker doesn't like doing Humungousaur's voice too much, as it's hard on his throat. This was also stated in the Ben 10: Alien Force video game.
 * In Omniverse, as a running gag through Season 1, Ben tried and failed to transform into Humungousaur on numerous occasions before finally transforming into him in Of Predators and Prey: Part 2, the final episode for Season 1.
 * In Omniverse, his sash is similar to Monsieur Mallah's from Teen Titans.
 * Humungousaur's icon replaced Echo Echo's in the arc 5 opening of Ben 10: Omniverse.
 * Humungousaur hasn't used his growing ability since Video Games.
 * Humungousaur is the second alien to have two fusions (Fourmungousaur and Humungoopsaur), the first being Four Arms.