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Mark Ruffalo Cast In HBO's I Know This Much Is True

HBO is continuing on its path of success in limited series like True Detective and the recent Big Little Lies, this time bringing in A-lister Mark Ruffalo to lead the charge. As announced by Deadline, Ruffalo will star in I Know This Much Is True, an eight-episode limited drama that adapts Wally Lamb's bestselling book of the same name, which was an Oprah's Book Club pick when it launched in 1998. 

Written and directed by Blue Valentine filmmaker Derek Cianfrance, I Know This Much Is True is an "epic family saga" that dives deep into America's national identity through the lives of twin brothers Dominick and Thomas Birdsey throughout the late 20th century. Ruffalo, best known for his work as Bruce Banner/The Hulk in Marvel's Avengers film franchise, will work double time, starring as both Dominick and Thomas.

Author Lamb has been collaborating with Ruffalo on a television adaptation of the book for the past two years. The pair will executive produce I Know This Much Is True alongside Ben Browning and Glen Basner of FilmNation Entertainment, the company behind Amy Adam's sci-fi triumph Arrival.

I Know This Much Is True marks Ruffalo's return to HBO, where he previously starred in 2014 television movie The Normal Heart. His performance as Ned Weeks, a character based on the playwright and AIDS activist Larry Kramer, earned him an Emmy nomination for Outstanding Lead Actor in a Miniseries or a Movie and a Golden Globe nomination for Best Performance by an Actor in a Miniseries or Motion Picture Made for Television.

Ruffalo, who recently snatched up an Oscar nomination for Spotlight in 2016, will next appear in Thor: Ragnarok alongside Chris Hemsworth, Tom Hiddleston, Cate Blanchett, Jeff Goldblum, and Tessa Thompson.