Aggregor

Aggregor (voiced by John DiMaggio) is a villain in the new series, Ben 10: Ultimate Alien. In Ultimate Crisis (Cartoon Network Official Game), Aggregor has robot drones,also he is shown to have fire and eletrictiy based abilities Aggregor also kidnapped the five new aliens in Ultimate Alien from the Andromeda Galaxy so it is possible he came from there as well. He made his first appearance in episode one of the first season Fame. He's possibly the main villain for Ben 10 Ultimate Alien Season 1.

Appearance
Aggregor's appearance is, for the most part, similar to that of a human. However, he has pink,pale skin and small horns coming out of his head. He has long black hair and red eyes. He wears a brown tunic and wields a spear-like weapon. It is unknown what alien race Aggregor is, however, Dwayne McDuffie confirmed that he is not an Osmosian.

Ultimate Alien
In Fame, after Bivalvan was defeated by Ultimate Spidermonkey, he explains that Aggregor captured him and his four other aliens but he managed to escape to Earth. At the end of the episode, instead of the Plumbers who Bivalvan was expecting to send him back to his planet, Aggregor appeared, having found him somehow. His first line was "No one escapes me, Bivalvan". Bivalvan is then heard screaming offscreen, indicating that Aggregor either killed him or tortured him before taking him away.

It is without a doubt that he will be searching for the other four aliens as well. Dwayne McDuffie has confirmed that no more Ben 10 villains in Ultimate Alien will be looking to take Ben's Ultimatrix, so it is known that stealing the Ultimatrix is not one of Aggregor's plots. All that is known about Aggregor is that he is extremely dangerous, and it is likely that kidnapping the five

aliens is only part of his plan.

He will reappear in the episode, Escape From Aggregor.

Trivia

 * Aggregor's appearance is very similar to a Zabrak (more specifically Eeth Koth) from Star Wars. It is possible Aggregor is based-on a Zabrak.
 * His appearance is also similar to some depictions of the devil (specifically the horns and pitchfork-like staff).
 * Aggregor's purpose for kidnapping the Andromeda Galaxy aliens is unknown at the moment, but might be revealed in Escape From Aggregor.
 * According to Dwayne McDuffie, he is a much greater threat than Vilgax.
 * He look's to be based on the devil