The `Inception` actress plays a killer whale trainer who loses her legs for her latest role, and while she admits it was an incredible experience to work with the mammals, she was frightened when one of them started menacing her.
She said: "One of the whales kind of went mad at me. She screamed at me with her jaws wide open. It was the only time I was really scared."
Marion said losing her legs for the screen wasn`t too hard, with the magic of digital technology, adding: "I just acted, then they took my legs off."
Marion has been a little less open about her character - Miranda Tate, an ecologically-minded businesswoman - in the new Batman film `The Dark Knight Rises`, but she will admit that she kisses Christian Bale`s character Bruce Wayne, whose alter ego is Batman, in the film.
She told Empire magazine: "Miranda is fascinated by Wayne Enterprises. They go through difficulties, and she wants to help provide the world clean energies. She`s a good guy.