Mandi Bierly
November 21, 2012 AT 06:00 PM EST

On Sunday, Nat Geo WILD premieres the new one-hour biopic Cesar Millan: The Real Story. In it, the famed Dog Whisperer, who crossed into the U.S. illegally in January 1991 when he was 21, returns to the border. In our exclusive clip below, Millan recounts the two weeks he spent trying to cross without a guide, why he would let the INS sometimes capture him, and how fate finally intervened.

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