Vision is a Marvel superhero who has been in the comics since 1968 and was introduced into the Marvel Cinematic Universe in 2015.
In the MCU, Vision is a synthetic human (an android, but a little more complex than that) whose body was created with synthetic flesh, a computerized nervous system, and the Mind Gem, which, as I said in part one, is an immensely powerful but little understood Infinity Stone. An evil AI named Ultron created the body to be his own, but the Avengers stole it from him before he could finish uploading himself. Then Tony Stark and Bruce Banner decided to upload Tony's AI assistant and friend, JARVIS, into the body's system. The other Avengers tried to stop them, but Thor Odinson used his lightning powers to bring Vision to life, stating that he had seen him in a vision given to him when Wanda Maximoff manipulated his thoughts and that Vision was a necessary part of the universe's future.