I would like it that Ultron came across Cloc, of Sentry note. Cloc had this beef with the Heroes, and sulked away, warning anyone who came near his new Cloc Tower, would be attacked. Ultron going into a situation with this kind of Intelligence, would have a friend in Cloc and a building program to work on. Ultron would also have a willing accomplice, who has something against the humans for destroying his master, the Sentry. I don't think Cloc ever could imagine that Sentry would be gone. Every time Sentry was destroyed in the past, the Sentry always re-emerged; and even when Sentry was given a memory blank, Cloc knew that he would come back. Now the Sentry has not come back, and Cloc can't rationalize his loss. I could see Ultron taking advantage of this and making an alliance with Cloc, in Clocs confusion. Even Reed Richards is disturbed that Sentry created something this sophisticated, but Richards is so understanding of the evil mind that he doesn't think it necessary to deactivate Cloc. Cloc and Ultron could make a good pairing, making tenticled Technomechs of a similar design to Cloc.