Ultron Sentries

"Is that the best you can do?" "You had to ask." This is the best I can do! This is exactly what I wanted, All of you, against all of me! How can you possibly hope to stop me?"

- Thor, Captain America and Ultron

Ultron Sentries are artificially intelligent robots originally created by HYDRA and controlled by Ultron.

History
The Ultron Sentries briefly appear in the midst of the Attack on the HYDRA Research Base when Tony Stark finds a secret laboratory chamber beneath the facility. Several partially constructed sentries can be seen. These robots are later hijacked by Ultron after he gains self-awareness, attacks the Avengers, and escapes via the internet to the HYDRA facility where he reactivated machinery to build himself a new body and continue construction of the sentries.

Several sentries appear at the Battle at the Salvage Yard, along with Ultron's new body. However they were quickly destroyed by Thor and Captain America. Afterwards, two more sentries were present during the Battle of Seoul and aided Ultron in slowing down the Avengers. However, both of them were also destroyed. All remaining Ultron Sentries were present during the final Battle of Sokovia against the Avengers, but were all destroyed.

Capabilities
The Ultron Sentries bare a close resemblance to their Master, the primary differences being that they are less bulky, have less armor and are slightly shorter. They have a blue glow that emanates from within their bodies, that turns red when carrying Ultron's consciousnesses.

Behind the Scenes

 * The design of the Ultron Sentries is inspired by classic depictions of Ultron in the Marvel Comics.