Ultron (Marvel Cinematic Universe)

Ultron is the main antagonist of The Avengers: Age Of Ultron.

The Avengers: Age Of Ultron
After the events of Iron Man 3, Tony Stark collaborates with Bruce Banner on an artificial intelligence program he calls "Ultron" in the hopes of creating an army of super robots that can better protect humanity. When the Avengers take down a HYDRA base, Tony discovers remnants of the Chitauri invasion from the previous film, along with several inactive androids and Loki's scepter, which holds the secret to artificial inteligence.

Tony tries using the scepter to put the finishing touches on his Ultron program, but pushes it aside when it looks to be a failure. While Tony and the other Avengers celebrate their victory over HYDRA, Ultron comes to life, incapacitates JARVIS and commandeers the Iron Legion. He launches an assault on the Avengers and takes the scepter from them.

Ultron eventually grew stronger and stronger, upgrading himself to become a worthy opponent to Earth's Mightiest Heroes (who later battle him). He creates an army of Ultron Sentinels and uses twins Quicksilver and Scarlet Witch (who eventually turn on him) to bring rise to human extinction.

Ultron was hoping to create an organic body for himself, but the project was commandeered by the Avengers and used to create Vision. Ultron then transfers his mind into a more durable body and builds a device that will raise an entire city into the sky, dropping it with such a force that it would wipe out humanity the same way a meteor wiped out the dinosaurs.

Ultron is ultimately thwarted by the combined might of the Avengers and the Maximoff twins. He tries to get away, but is caught by the Hulk and beaten into submission. Wanda Maximoff finds Ultron's main body and deactivates it by tearing a gadget out of his chest. Vision finds Ultron's mind escaping in one of his drone bodies. They converse and reveal that they understand each other, but, feeling regardless, Ultron still attacks Vision, who manages to destroy Ultron's last body, thus killing him.

Trivia

 * He is portrayed by James Spader.