Vaxasaurian warriors
General Information
Homeworld Terradino
Height 12 feet (base form)
60 feet (after using their size-changing powers)
Locomotion Bipedal
Sapience Level Sapience
Subspecies/Races Evolved Vaxasaurian
Behind the Scenes
Universe Ben 10 Universe

Vaxasaurians are an extraterrestrial species of humanoid dinosaur-like aliens from the planet Terradino.

Appearance Edit

In their normal size Vaxasaurians resemble humanoid dinosaurs with four-fingered hands that have ape-like nails on the end of each. Their feet are elephant-like and have three toes. They naturally have either green eyes with no pupils or red eyes with cat-like pupils, along with brow-like extensions. Their teeth are white and almost human-like with the exception of a few fangs.

Male Vaxasaurians have tan, brown, beige, dark green and gray skin with their underbellies, the front side of their necks, and the sides of the arms that face the body being lighter-colored.

Females have medium red skin and slightly darker underbellies. Their chins are slimmer and they have stripes around their body that are the same color as the skin but darker. They also appear to have feminine breasts similar in appearance to those found on female humans, hinting the species to be more mammalian than reptilian.

Vaxasaurians can occasionally be seen in clothing. The attire can include caveman-like loincloths, stone-based accessories and/or bones and skulls of other species.


The Vaxasaurians' natural predator are Tyrannopedes, especially since they are unable to lift them for long periods of time, and can be trapped by their webbing.

Powers Edit

Vaxasaurians can grow their size at well, making their dinosaurian features pronounced. As such they gain stegosaurid plates on their backs and thagomizers on the tail. Three plates on their shoulders separate and grow along with the plates on the forearms. A small triangular extension on the top chest plate forms on the bottom while the bottom sides stretch down and curve towards the center, ending at a point. The legs seem to become slightly longer.

Vaxasaurians possess enhanced strength at a level that allows them to thrown objects into near-orbit and, according to Duncan Rouleau, is technically similar to that of Sasquatch. According to Dwayne McDuffie, they are physically stronger than Methanosians and Crystalsapiens.

According to McDuffie, Vaxasaurians can generate their Stegosauride features without having to change their size. They can also shrink down to about 10 feet. According to Eugene Son, they can lift a To'kustar with ease, even in their base height.

Vaxasaurians can temporarily survive in the vacuum of space without any special equipment.

A Vaxasaurian's thick hide makes them durable against most attacks.

Vaxasaurians are quite agile for their size.

Certain Vaxasaurians have naturally occurring weapons on the ends of their tails that resemble a plethora of medieval weaponry. These include maces, swords, war hammers, and battle axes.

Weaknesses Edit

Vaxasaurians are very slow and unable to fit in tight places. According to Rouleau, Vaxasaurians in the reboot continuity cannot alter their size.

Vaxasaurians are built for land, meaning they are unable to breath underwater.

Vaxasaurians are can be harmed by electricity, such as an Amperi's attacks. They can also be harmed by fire even when at full size, such as the attacks of either a Methanosian or a Pyronite.

Vaxasaurians can be trapped by an Evolved Arachnichimp's webbing.

Despite their enhanced strength, they are unable to lift anything bigger than a Tyrannopede. Technically speaking, they are physically weaker than Evolved Vaxasaurians. According to McDuffie and Rouleau, they are also physically weaker than Tetramands and Metahumans with the same powers as the Hulk.

A Vaxasaurian's tail weapon can accidentally cause collateral damage and even injure themselves.

Omnitrix Transformation Edit

The Omnitrix's Vaxasaurian representative is named Humungousaur, who first appeared in the Alien Force episode "Ben 10 Returns: Part 2". Humungousaur has appeared in every subsequent series.

The Ben Tennyson of Dimension 23 has an equivalent of Humungousaur named Dino-Mighty, who first appeared in the Omniverse episode "It's a Mad, Mad, Mad Ben World: Part 2".

Humungousaur has also been used by the Prime Timeline Gwen and Azmuth, Albedo, Vilgax's Bioid army, the Ben 10 Franklin version of Benjamin Franklin, a Plant Clone, and the Alpha Nanite.


Notes Edit

  • Like humans, a Vaxasaurian can develop a need for glasses.
  • According to Rouleau, the Omnitrix from the Ben 10 reboot contains Vaxasaurian DNA. Therefore, Humungousaur was one of the countless aliens whose DNA pod was glimpsed in the episode "Innervasion Part 5: High Override" before being added to the active playlist for Season 3.
    • As shown in the opening for Season 3, Humungousaur has replaced Wildvine in the active playlist.
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