Looper is a sci-fi time travel thriller that finds a group of hit men traveling into the past to kill their victims before they can commit their crimes. We haven't heard much about the movie at this point. Now, Joseph Gordon-Levitt, while promoting Inception in Shanghai, has called Looper, perhaps, the most important film of his career.

Here is what Joseph Gordon-Levitt had to say about Looper.

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"I feel now, doing 'Looper,' is the result of what happened with 'Inception.' It is something I have been working for my whole life. It is like nothing I have seen before. It has action. It has romance. It also deals with philosophy. I really like it."