As part of a plan to take over Ultron's reign, Doctor Doom assembled a team of Avengers from different points in time, and had two of them, Vision and Iron Man, assault the Avengers Tower, the location from where all of Ultron's drone factories were controlled.
Vision and Iron Man successfully accomplished their mission, believing to have destroyed the power source of the factories. However, Doom had lied to them, and what they had destroyed was actually the security systems, allowing Doom to hack into the factories and gain control of Ultron's army, retrofitting the drones to his own image.
Following Ultron's defeat, Doctor Doom used the newly-aquired army to hunt down the time-displaced Avengers, who had escaped before Doom could send them back to their time periods. After finding themselves surrounded by a neverending army of sentinels, the Avengers took the fight to Doom, and convinced him to free the Earth.
- 44 Appearances of Ultron Sentinel
- 17 Minor Appearances of Ultron Sentinel
- 7 Media Ultron Sentinel was Mentioned in
- 75 Images featuring Ultron Sentinel
- Item Gallery: Ultron Sentinel