"There's a Shakespearean aspect to the story that Joss Whedon has crafted - particularly with the villain Ultron. His artificial intelligence is created by Tony Stark to protect humanity, but because Ultron's born of Tony's ego, he's tragically flawed," she said.

And Scarlett Johansson found the movie particularly exciting for her character. "Black Widow has experienced a lot of trauma and never been able to make active choices for herself, but now she's ready.

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"I'm looking at it as an actor, looking for material that's substantial. So when you're shooting a page of the script over two weeks it gives you something real to hold on to," she added.