VGWALKTHROUGH.COM does a review of the Avengers 2 Age of Ultron.

In the first part, one re-visualizes the scene of the carnage that the Avengers rain on their enemies, as they seek to get back the scepter of Loki, with the Mind Stone, one of the 6 infinity stones back to their headquarters (at the beginning, this is Starks Towers).

The Avengers blast and rampage their way through the defenses, with Ironman leading the way. The enemies unleash their own weapons, in the form of the Scarlet Witch and Quicksilver. Quicksilver just about flashes past everyone on the ground.

However, the most deadly of the enemies and their weapons is always in the mind. Just as Stark “uncloaks” from his Ironman outfit, the witch goes in and unleashes his fear.

Stark begins the process that leads to the most extensive and elaborate defense project on Earth. And the concept of Ultron is born.