Avenger Tower

Walkthrough: While the rest of the heroes went on the search for the Infinity Stones, Iron Man and Spencer stay back at Avenger Tower with Thanos. It is then that Ultron Sigma sends Ultron Drones to attack the tower, being the perfect opportunity since many of the heroes are away and Thanos is still locked up. You will have to hold off the Drones for at least two minutes while the shields of the tower charge, and you only have the use of Iron Man and Spencer to do this with.

After the two minutes, the shields will activate; however, they aren't enough to stop Ultron Sigma from coming to kill Thanos. Iron Man, Spencer and Dr. Light (through hologram) try to stop Ultron Sigma while he attempts to kill Thanos, but they ultimately end up frying the tower's energy source, thus letting Thanos free. But instead of fleeing or attempting to fight the heroes, Thanos, who you will fight as, will actually attempt to battle Ultron Sigma.

Ultron Sigma is tough, but he'll start the match with already one fourth of his health missing. Remember to watch out for the abilities of his Space and Reality Stone, as they can literally change the outcome of the match in a heartbeat. Being victorious in the bout will cause Thanos to actually hit Ultron Sigma hard enough to crack his Reality Stone. Knowing he is too vulnerable now, Sigma runs aways and leaves the heroes to continue their search for the other Infinity Stones.

Playable Characters

Iron Man

Spencer

Thanos