Ultron (2010 Marvel Animated Universe)

"I've hoped humans and Inhumans would annihilate each other for me, but if I want the job done right, I'll have to do it my self. Now a new world order; THE ULTRON REVOLUTION!"

- Ultron revealing his true colors to the Avengers. "Your father's creation has no limits to how much power it can absorb. So now, neither do I. Prepare for humanity's end."

- Ultron's first quote.

Ultron is a major antagonist in Avengers Assemble, serving as the main antagonist in the second half of Season 2 and the main antagonist in Season 3 (entitled Avengers: Ultron Revolution).

Voice Portrayals

 * He was voiced by Jim Meskimen, who also voiced Arsenal, and Ultron Sigma.
 * When possessing J.A.R.V.I.S., he is voiced David Kaye, who also voiced Megatron, Sesshomaru, Treize Khushrenada, Recoome in Ocean dub Dragonball Z, and Professor Ramone De La Porta.
 * As Nightmare Ultron, he is voiced by Fred Tatasciore, who also voices Nikolai Belinski, Saren Arterius, Poseidon, Atlas, Typhon, Kil'jaeden, Von Twirlenkiller, Bane, Kuril, Ratash, Solomon Grundy, Agandaur, Ka'hairal Balak, Tony Alpert, and Helm Hammerhead.
 * As Truman Marsh, he is voiced by William Salyers, who also voiced Doctor Octopus, and Victor Valente.

History
Ultron debutes in the episode, Thanos Triumphant. After the Avengers defeated Thanos with aid of Howard Stark's robot invention, Arsenal, that is designed to absorb and maintain massive amounts of energy - which Tony exploited this ability to absorb the power of the Infinity Gauntlet to defeat Thanos - Ultron hacks into Arsenal and fires a surge of energy at the Avengers. Once Ultron drains the Infinity Stones of their powers, he tosses the Gauntlet aside and escapes using his thrusters.

In Crack in the System, while the Avengers host a celebratory party for defeating Thanos, Captain America monitors Ultron's possible whereabouts in consternation and then converses with Tony. Tony assures him that he invented an app that has the intent to detect Ultron and shows no sign of the latter. As Captain America is then persuaded to join the celebration, however, the Avengers are assaulted by arachnid-like robot that invades their tower. While fighting the robot, the Avengers debate whether this attack is related to Ultron. Once the Avengers destroy the robot, Tony analyzes its circuitry in his lab and finds no trace of Ultron. Tony reveals to the Avengers a malware he designed as a solution to destroy not only Ultron, but Arsenal as well. The Avengers locate the robot's manufactoring at a facility owned by Justin Hammer, where they are assaulted by Dreadnaughts led by an armored Justin Hammer.

Trivia

 * His secondary form is a tie into the film Avengers: Age of Ultron.