Vulkanus

Vulkanus is a Detrovite criminal.

Powers and Abilities
While inside his mechanical suit, Vulkanus has superhuman strength and durability. It is durable enough to easily shrug off lasers, can stand up to Four Arms, and it has a drill hand-built into it. He is also naturally resistant to extreme heat.

Vulkanus is usually equipped with a hand blaster that can shoot blasts of energy. He has his mining workers and admits that he is "stinkin' rich" in Greetings From Techadon.

Original Series
In the original series, he is almost always seen with Sixsix. Vulkanus partnered up with Sixsix in order to build a weapon capable of destroying a solar system using element X. He is stopped by Ben and the Galactic Enforcers in the episode, The Galactic Enforcers.

He re-appears in Ben's dream world in Perfect Day, working alongside Sixsix again.

In the start of the future episode Ken 10, where he was defeated by Ben 10,000 and was transported to the Null Void.

Alien Force
Vulkanus makes a brief appearance in Ben 10: Alien Force in the episode Kevin's Big Score. From this appearance on, he now has a chrome-purple suit. According to himself, he was betrayed by Kevin during a "counterfeit isotope" scam a few years earlier. Kevin left him holding the merchandise when The Plumbers arrived, and though he managed to escape, the Plumbers destroyed his ship. Unable to leave Earth, he resorted to trading level three alien technology to get by. When Kevin arrives looking to obtain an important item (a holo-viewer from Grandpa Max), Vulkanus decides to get back at him for the betrayal by forcing Kevin to absorb a small piece of Taydenite, the rarest living gem in the galaxy. This causes Kevin's body to mass-produce the gem, thus giving Vulkanus an endless supply. However, he is foiled by Ben, who uses Big Chill to literally freeze off his armor, revealing that Vulkanus is really nothing more than a minuscule alien in a giant suit. Rather than attempt to arrest him, however, Kevin leaves Vulkanus with the small fortune in crystals he had managed to chip off beforehand, considering it as payment for his past actions.

He reappears in Inferno where he used the Taedenite he gathered from Kevin to purchase the Earth and turn it into his home by pumping the magma out of the mantle in order to detonate a bomb which will raise the Earth's surface temperature to 800 degrees. The bomb is stopped by Ben and Kevin is happy that Vulkanus wasted his money.

He makes a brief appearance in Con of Rath. When Ben (as Rath), Gwen, Kevin discover they need Taydenite to power their ship, Gwen tells Kevin that every time they come across Taydenite they run into Vulkanus. Kevin says their imagining things only to be confronted by Vulkanus the next second. Kevin tries to negotiate with Vulkanus using a gold credit cube(an alien form of currency with zero spending limit) but Vulkanus holds firm saying that the three of them were on his planet without any other transactor in viscinity. He is defeated by Rath who ruined most of his Taydenite. Beaten Vulkanus is forced to hand over his remaining Taydenite.

Ultimate Alien
Vulkanus also appears as one of the villains after Ben in Hit 'Em Where They Live, teaming up with Zombozo and Charmcaster and is beaten at the end by Ben as Ultimate Big Chill.

Vulkanus was suddenly afraid of Ultimate Big Chill after witnessing the effect with his "ice flames" He appeared again in Absolute Power being beat up by Humungousaur because he wanted answers about where Kevin was.

In Greetings From Techadon, he bought a Custom Techadon Factory to destroy Ben, only for Ben to discover how the Techadons were tracking him and prevent them from doing it. This angered Vulkanus and he states that he wasted "enough to buy a whole solar system" for the defunct factory. Ben then uses Kevin's old ID Mask to put a fake Ultimatrix symbol on his back, causing one of the Custom-Built Techadons to begin chasing him instead of Ben. He flies away screaming that he wishes he could hate Ben to death.

Omniverse
Vulkanus returns in Special Delivery where he tries to be the first to gather the dwarf star that was unintentionally in Ben's possession. He is defeated, alongside Fistina, by Humungousaur.

Ben 10

 * The Galactic Enforcers (first appearance)
 * Perfect Day (dream)
 * Ken 10  (Ben 10000 timeline)

Ben 10: Alien Force

 * Kevin's Big Score (first re-appearance)
 * Inferno
 * Con of Rath

Ben 10: Ultimate Alien

 * Hit 'Em Where They Live (first re-appearance)
 * Absolute Power: Part 1
 * Greetings From Techadon

Ben 10: Omniverse

 * Special Delivery (first re-appearance)

Ben 10 Ultimate Alien: Cosmic Destruction
Vulkanus appears in Ben 10 Ultimate Alien: Cosmic Destruction. His role in the game is that of a minor antagonist. He is the mini-boss of the Catacombs level.

Trivia

 * Vulkanus's name probably derives from "volcanic", due to his heat-resistant abilities, and the name of his home planet, Vulcan, which, in itself, is named after the Roman god of smithery of the same name.
 * Also Vulcanus is the Latin form of the Roman god Vulcan.
 * In the original series, Vulkanus seemed to be at the same build as Technorg minus the mace hand, but from Alien Force onward, he is shown to have an infant-like body. Dwayne McDuffie has confirmed that he was this size the whole time his suit and Technorg's suits were merely colored in mimic flesh.
 * It's revealed in Inferno that Vulkanus currently owns the planet Earth.
 * In Absolute Power: Part 1, Vulkanus revealed that whenever his suit gets either damaged or destroyed; the arms are the hardest to repair because "They're always on back-order".
 * In Kevin's Big Score, his suit was a greenish color but in his other appearances it is purple, and in Greetings From Techadon, it was more of a violet color.