I Know This Much Is True: Mark Ruffalo in Character as Dominick Birdsey

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Mark Ruffalo on playing Dominick Birdsey and the many factors that make the imperfect character relatable. I Know This Much Is True airs Sundays at 9 pm.

Based on the 1998 bestselling novel by Wally Lamb, adapted and directed by Derek Cianfrance, this limited series follows the parallel lives of identical twin brothers, played by Mark Ruffalo. A family saga, it tells a story of betrayal, sacrifice and forgiveness set against the backdrop of 20th-century America.