Mark Ruffalo Transforms Into Twin Brothers for New HBO Series

Mark Ruffalo in "I Know This Much is True." Image via HBO/Twitter

Marc Ruffalo is playing identical twins in HBO’s miniseries I Know This Much Is True, but as we all know, no one is 100 percent identical. 

Ruffalo faced the challenge of playing identical twins who actually look completely different. Playing two very different identical twin brothers Dominick and Thomas Birdsey meant that the actor has to undergo a major transformation, which meant gaining a whopping 30 pounds. 

“We didn’t want it to be like I run and throw a wig on and do the same scene on the same day, so we took six weeks off to really separate these two guys,” Ruffalo said.

Separating the two and taking time off to gain weight was a lonely and even difficult process to go through. 

“Putting on the weight for Thomas was really challenging. I didn’t expect it to be,” said Ruffalo. “I thought I was going to have a fun time doing that, but when you’re force-feeding yourself, some of the romance of food sort of leaves.” 

The six-part series was written and directed by Derek Cianfrance. 

I Know This Much Is True will premiere on HBO this April.