12. Avengers: Age of Ultron (2015)
Ultron is born after the Mind Gem is snatched away from Baron Strucker, thanks to the Avengers. The stone finally appears in front of the artificial intelligence that was created by Tony Stark and the Vision, an android robot that emerged from the J.A.R.V.I.S. evolution.
After the credits, we see Thanos putting on the Infinity Gauntlet and disappointed by his pawns’ actions, he swears to retrieve the Infinity Stones himself.