The Avengers fight amongst themselves when Stark and Banner secretly upload J. A. R. V. I. S. —who is still operational after hiding from Ultron inside the Internet—into the synthetic body. Thor returns to help activate the body, explaining based on his vision that the gem on its brow is the Mind Stone, one of the six Infinity Stones, the most powerful objects in existence. This "Vision" and the Maximoffs accompany the Avengers to Sokovia, where Ultron has used the remaining vibranium to build a machine to lift a large part of the capital city skyward, intending to crash it into the ground to cause global extinction. Banner rescues Romanoff, who awakens the Hulk for the battle. The Avengers fight Ultron's army while Fury arrives in a Helicarrier with Maria Hill, James Rhodes and S. H. I. E. L. D. agents to evacuate civilians. Pietro dies when he shields Barton from gunfire, and a vengeful Wanda abandons her post to destroy Ultron's primary body, which allows one of his drones to activate the machine. The city plummets, but Stark and Thor overload the machine and shatter the landmass. In the aftermath, the Hulk, unwilling to endanger Romanoff by being with her, departs in a Quinjet, while Vision confronts and seemingly destroys Ultron's last remaining body.