The mob of the future maintains its iron grip on society by utilizing the ultimate existential weapon — time travel. When they want to get rid of someone, that person gets sent back in time where a waiting killer executes them, closing the loop on that person, permanently. But what happens when one of these killers — dubbed “Loopers” — ends up face-to-face with an older version of himself? In Rian Johnson’s loopy sci-fi thriller, Joseph Gordon-Levitt and Bruce Willis face off as the two heads of the same coin come together with deadly support from Emily Blunt, Paul Dano and Jeff Daniels. Now in theaters. (R) Not screened for review