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Heroes - “Five Years Gone” - Episode 20

Hiro and Ando find themselves five years after the destruction of New York. People with extraordinary abilities are labeled as terrorists and Sylar has assumed the form of Nathan and is the President. Hiro and Ando eventually return to the present with the help of future Peter and Hiro finds out that he must kill Sylar to prevent the potential future that they had just visited from happening.
Source:Wikipedia