Sunder

Sunder is an alien bounty hunter who first appeared in Singlehanded.

Appearance
In Ben 10: Alien Force, Sunder is a hulking, humanoid alien, with grey skin. He wears a black, overall-like outfit with a red trim. Sunder has long, white hair, and a scar on his left eye. His eyes are black with red pupils, and he has two slits for a nose. In addition to that, Sunder also has a black trim around his face.

In Omniverse, Sunder wears a metalic mask, with two black indentions around both of his eyes, in place of his scar. Now, Sunder's eyes are red, with black pupils, and has a red scar, in the shape of an "x" on both of his shoulders. Sunder continues to wear the black overall-like outfit, with the red trim, with a few modifications; he now wears spiked shoulder straps, and wrist bands, with three metal straps around both of his upper legs.

Alien Force
He was sent by Vilgax to pursue Ben and to try to remove the Omnitrix from Ben by using his energy axe to bring to his master. The result inadvertently sent Ben to the Null Void, while Ben's left hand remained on Earth. Ben's hand gains its own accord and manages to escape from Sunder by knocking him out before leaving to find help.

When the hand was found by Julie, she brought it to Gwen and Kevin. They fought to keep Ben's left hand from falling into Sunder's clutches. When Kevin invented a machine that could bring Ben back, it was a success except that Ben's left hand is now in the Null Void. As Sunder charged toward the group, Kevin activated the machine once again and restored Ben's left hand to his body. However, it also sent Sunder to the Void, trying to get his axe back from a giant Havok Beast and being surround by cheering Havok Beasts.

Ultimate Alien
Sunder returned in the first episode of Season 2, The Transmogrification of Eunice, where he was on a mission to retrieve the Unitrix, which has taken the form of a girl named Eunice. At first, Ben and his team thought Sunder wanted Eunice for himself, but at the end, it is revealed that Azmuth hired him to bring Eunice back to him in exchange for being released from the Null Void. Ben convinced Azmuth to let Eunice have a normal life and be one of his assistants, as he always needed help tending to Primus. When Azmuth, Eunice, and Sunder left, Sunder asked Azmuth if he was still getting paid, despite his failure.

Omniverse
Sunder returned in Have I Got A Deal For You, having reverted back to his evil ways, and battled Shocksquatch in Undertown. As before, he was after Ben's Omnitrix, but was defeated.

During Special Delivery, he and several other villains try to get the Dwarf Star in Ben's possession, but was again defeated.

In Cough It Up, he wrecks Sock Vendor's shop in order to get a mysterious item that he have never seen. The Vendor is unaware and offers him socks. Sunder is just about to finish him but he founds a pair of soft socks that he later takes with himself. Ball Weevil appears to fight Sunder but gets tied up in socks. Before he could finish Ben once and for all, Spanner appears and fights him. At the Black Hole, he tells Psyphon that he wants to know more about this weapon. Psyphon points out that he likes his new socks which makes Sunder embarrased. At the end of the episode he was banned from Undertown.

In Universe Vs. Tennyson, he was freed by Chadzmuth from his cell but was later recaptured by Ben.

Powers and Abilities
Sunder possesses enhanced strength sufficient enough to hold his own against Ultimate Cannonbolt, Kevin, Gwen, and Eunice all at once.

Sunder is durable enough to withstand being able to withstand Diamondhead's shards at point-blank to the face, though it still causes him discomfort.

Equipment
Sunder has an axe which is able to send whatever it slices to a different dimension when it strikes something such as the Prototype Omnitrix, as he was able to send Ben (minus his Omnitrix hand) to the Null Void. Sunder uses a hoverboard for flight and transportation.

Sunder has many gadgets inside his hoverboard.

In The Transmogrification of Eunice, Sunder possessed a powerful blaster-pistol which he revealed he had obtained on Galvan Prime.