[Dr Cho encounters Ultron in her lab]
Ultron: Scream, and all your staff die. I could have killed you earlier on, but I didn't.
Dr. Helen Cho: You couldn't.
Ultron: I didn't, because you have something I want. Your work on artificial tissue has been fascinating.
Dr. Helen Cho: It won't work with you.
Ultron: With the proper development, it will... and of course your cooperation.
[uses the scepter on Dr Cho]