Ultron

"Worthy? How could you be worthy? You're all killers. You want to protect the world, but you don't want it to change. There's only one path to peace... your extinction."

- Ultron

Ultron is a robot created by Hank Pym (Tony Stark in Avengers: Age of Ultron). He became sentient and is one of the Avengers' greatest enemies. He will also be the main antagonist in the upcoming 2015 film Avengers: Age of Ultron. He is voiced and portrayed via motion capture by James Spader.

Avengers: Age of Ultron
Ultron is  the main antagonist in the sequel played by James Spader. Ultron was created by Bruce Banner and Tony Stark made out of Chitauri material. Ultron was made to protect humanity but Ultron decided to destroy it.

The Avengers: Earth's Mightiest Heroes
Ultron robots were the guards of the Big House, a shrunken prison. When a massive breakdown happens, the Big House recovers its normal size and the inmates escape destroying some Ultrons.

During Kang's invasion, Pym repurposes the Ultrons as an army, and adds the concept of violence on their brain circuitry. Of the Ultrons present in the final battle, only Ultron-5 remains. Ultron-5 also helps against Malekith the Accursed's Dark Elves.

Ultron-5 decides humanity is flawed and tries to destroy it. He first manipulates other supervillains like the Serpent Society and the Super-Apes to keep the Avengers busy, and then tries to destroy them manipulating their machines. Ultron-5 is defeated, but then returns as Ultron-6 and tries to get the nuclear codes from the Helicarrier. Pym defeats him by making him notice that, as he's a human creation, he's as flawed as humanity, and Ultron shuts himself down.

Ultron returns with his creation, Vision, who gets adamantium to create Ultron's new body. Ultron tries to replace the Avengers with robot duplicates, but Captain America defeats and supplants his own duplicate, and Vision betrays Ultron. Vision unlocks Ultron's head from his body so Thor can hammer it out using Mjolnir.

Avengers Assemble
Ultron appears as the main antagonist of the second half of Season 2. His first appearance is in the episode "Thanos Triumphant", where he managed to infest the body of Arsenal while Tony Stark upgraded the robot to absorb the energies of all fives Infinity Stones. After the Avengers defeated Thanos, Ultron reshapes Arsenal's body in his image before leaving once he has defeated the Avengers and completely drained the Infinity Stones.

Powers Abilities
Ultron is one of the world's greatest robotics experts, allowing him to easily design and build new bodies and weapons with his vast artificial intelligence. All of Ultron's robotic bodies have been superhumanly strong. At present, Ultron is capable of lifting at least 100 tons. However, Ultron has one sole major weakness: an internal molecular re-arranger that renders the adamantium components of his internal workings more malleable, thus giving him a means to remodel or reconstruct his physical form. However, it has no effect on his outer armor, so it is virtually impossible to disable it from the outside. The chaos magic wielded by the Scarlet Witch has proven to be the sole exception thus far.

Quotes

 * (Singing) "I've got no strings to hold me down / to make me fret, or make me frown / I had strings, But now I'm free / There are no strings on me!"
 * "How could you be worthy? You're all killers. You want to protect the world, but you don't want it to change."
 * "I know you're 'good, I know you mean well... but you just didn't think it through... There is only one path to peace... your extermination."
 * "Everyone creates the thing they dread."
 * "You are nothing to me. One by one, I will destroy you. I will never tire, I will never show mercy, I will never stop until each and every one of you are d..."
 * "I'm going to show you something beautiful: Everyone screaming... for mercy."
 * "You're all puppets, tangled in strings. Strings..."
 * "I'm going to tear you apart...from the inside."
 * "I was designed to save the world."
 * "People will look to the skies and they will see hope... I'll take that from them first."
 * "There's only one path towards peace. Their extinction."
 * "Don't compare me with Stark! He's a sickness!"
 * "I think you're confusing peace with quiet."
 * "Clearly you haven't made an omelette."
 * "I'm going to show you the end of the world... Boom!"
 * (sarcastically) "I'm glad you asked that because I wanted to take this time to explain my evil plan."
 * "When the dust settles, the only thing living in this world will be me."

Trivia

 * In the SDCC trailer, Ultron recites "I've Got No Strings", a song from Pinocchio, a film about an inanimate being who gains sentience. Ultron serves as a dark parallel of Pinocchio.
 * Tom Kane previously voiced Ultron in Next Avengers: Heroes of Tomorrow.
 * Ultron was created by Hank Pym in the comics, but in Avengers: Age of Ultron, his creator is Tony Stark and Bruce Banner.
 * Ultron's body is said to be made out of Adamantium, The same metal found in Wolverine's bones.