Joseph Gordon-Levitt

Alan Markfield

 It’s the most fantastical, modern science-fiction concept: Joseph Gordon-Levitt passing as a younger version of Bruce Willis.

But that’s exactly what writer-director Rian Johnson pulled off for his time-travel tale about the mob of the future, where they send their victims 30 years in the past — to 2042 — to get rubbed out.

Opening Friday, “Looper” stars the 31-year-old Gordon-Levitt as Joe, one of those “loopers” contracted to show up at a certain time and place and just pull the trigger. In a dystopian world with a bad economy, it’s a lucrative gig — at least until the gangsters send back your future self for execution to “close the loop.”

Willis, 26 years older than Gordon-Levitt, also plays Joe. Willis is the version from the future, the one who mucks up his younger self’s life by escaping.

In 2012, of course, the two actors look nothing alike.

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