Naughty Dog is currently developing the inaugural downloadable content, entitled Left Behind, for their Summer 2013 hit, The Last of Us. The DLC will chronicle some of Ellie's early life before she met up with Joel. Ashley Johnson, the actress who portrayed Ellie, recently expressed some of her excitement and insight into the story and its gameplay in a recent interview with Fred Dutton of the PlayStation Blog.

"It’s a little bit more 'fun,' because you have two teenage girls going through a mall. It’s kind of like a post-pandemic version of two teenage girls hanging out," Ms. Johnson explained, "Definitely not a normal hangout! It’s very different — a little more playful." Ms. Johnson described her character Ellie's relationship with Riley (portrayed by Yaani King), "vastly different to the one with Joel — firstly, they’re best friends and secondly, they’re both teenage girls...There’s a playfulness and silliness that wasn’t necessarily there with Joel! It’s a different kind of relationship — I love it. Some of the stuff that we captured for Left Behind is my favourite stuff that we’ve done on the whole project."

The Last of Us: Left Behind is currently being developed by Naughty Dog.