Mark Ruffalo to Play Twins in HBO Limited Series

'I Know This Much Is True' is based on author Wally Lamb's best-selling book of the same name.
Getty Images; Courtesy of Harper Collins Publishers
Mark Ruffalo

Mark Ruffalo is returning to HBO.

The actor is set to star in and executive produce the premium cable network's straight-to-series limited drama I Know This Much Is True. The six-episode series is based on Wally Lamb's New York Times best-selling book of the same name.

The family saga follows the parallel lives of identical twin brothers in what is described as an epic story of betrayal, sacrifice and forgiveness that is set against the backdrop of 20th century America. Ruffalo will play twin brothers Dominick and Thomas Birdsey.

Derek Cianfrance (features The Place Beyond the Pines, Blue Valentine) will pen the script, direct and exec produce alongside Ruffalo, FilmNation Entertainment's Ben Browning and Glen Basner, Lamb, Gregg Fienberg and Anya Epstein. Lynette Howell Taylor and Jamie Patricof will co-exec produce.

The casting brings Ruffalo back to HBO following his award-winning role in the Ryan Murphy telepic The Normal Heart, which he also exec produced. Ruffalo's big-screen credits include playing Bruce Banner/The Hulk in Marvel's Avengers franchise, Collateral, Spotlight, The Kids Are All Right and more. He is repped by UTA, Lighthouse Management and Media and Klevan Longarzo.

Lamb has authored multiple books, two of which were selected for Oprah's Book Club.

FilmNation Entertainment's credits include Arrival and The Big Sick.

I Know This Much Is True arrives as HBO is doubling down on programming as part of new corporate parent AT&T's efforts to increase originals in a bid to better compete with Netflix. The cabler recently wrapped the limited series Sharp Objects and picked up The Time Traveler's Wife, Watchmen, Euphoria, Mrs. Fletcher, Los Espookys and Joss Whedon's The Nevers. Next up are season two of Big Little Lies and the Nicole Kidman starrer The Undoing, among others.