Originally Posted by KRYPTON INC.
I actually hope that Ultron is most afraid of Thor. The power of Asgard should by all rights be well outside his purview.
I wouldn't say Ultron should be afraid
of him in a direct sense, but it would be good if he recognized him as the biggest threat. I liked in the Earth's Mightiest Heroes cartoon, when Ultron had his synthezoids fight him, the strategy was to keep his hammer away from him and focus all their energy on grinding Thor into the ground. Thor is the team's most powerful member and the villains should act in a way to counter that.