Thanos’ powerful new army of villains is almost complete, but there’s still one final piece missing…Ultron! Using the Quantum Tunnel, Thanos travels back in time to rescue Ultron from his defeat at the hands of the Avengers. With his plan now complete, Thanos is ready to defeat the Avengers once and for all! Meanwhile, Iron Man, Captain America and Black Widow prepare the team for battle by using a new Hulkbuster…and something old from Howard Stark.