"I don't want to kill Ultron. He's unique. And he's in pain. But that pain will roll over the Earth. So he must be destroyed — every form he's built, every trace of his presence on the 'net. We have to act now, and not one of us can do it without the other. Maybe I am a monster … I don't think I would know if I were one. I'm not what you are, and not what you intended. So there may be no way to make you trust me. [casually hands Thor his hammer Mjöllnir ] But we need to go."
January 1, 1970
https://en.wikiquote.org/wiki/Monster