Vision
The Vision is an android created by Ultron in the Marvel Cinematic Universe.
History
Vision is a combination of human and alien technologies. Ultron had the body made using an advanced Earth technology for synthesizing human tissue, but the also had vibranium incorporated into the structure by exposing the developer to alien technology. Ultron intended to upload his core intelligence into the new body, but the Avengers intervened before the upload was complete, capturing the body. Tony Stark then sought to install a more friendly AI into the body. Despite some disputes with the other Avengers, the upload of a more friendly intelligence was eventually completed. The android assisted in the defeat of Ultron and subsequently became an Avenger itself.
Attributes
The Vision has superhuman strength and durability. The incorporation of vibranium into its structure suggests that it can absorb unspecified amounts of energy in a variety of forms without suffering damage, and it endured numerous attacks from Ultron's robot bodies without suffering any harm.
An Infinity Stone (the "Mind Stone") was attached to the body by Ultron to give it the capacity to hold its artificial intelligence. In addition to whatever mental capabilities the stone grants, it is also able to generate powerful energy blasts.
Vision is also capable of independent flight, but its top flight speed is not yet known.
Vision is able to lift and wield the hammer of Thor, which requires that the wielder be worthy in the judgement of Odin. It is not yet clear why Vision meets the hammer's "worthiness" criteria.
Trivia
In Marvel comics, the Vision is an android with the power to alter its own density, and the jewel in its forehead is able to generate blasts of solar energy. It is not normally associated with an "Infinity Gem".