The Left Behind downloadable content expansion for PS3-exclusive The Last of us is set to drop tomorrow, and as is customary, developer Naughty Dog has released the obligatory launch trailer. In the clip we see Ellie and newcomer Riley just being your average teenage girls in post-pandemic USA.

Naughty Dog Creative Director Neil Druckmann had a few heartfelt words to say on the occasion over on the official PlayStation Blog:

To date we’ve received over 230 Game of the Year picks around the globe. We are deeply honoured and humbled to receive such high praise and recognition from our peers and industry fans. On behalf of everyone that worked on The Last of Us, thank you!

We’re proud to continue this strong month by releasing our first ever single-player downloadable story campaign, The Last of Us: Left Behind. Unless you’re on a media blackout check out the launch trailer above for Left Behind.

Left Behind tells the story of Ellie and Riley. It continues the themes of survival, loyalty, and love that we explored in the full game. We wanted to dig deeper into the events that transformed Ellie into the fighter players were introduced to on her fateful meeting with Joel. What does it mean for two teenagers to survive in a world that offers little hope? How far will you go to save yourself? How far will you go to save the ones you love?

While you might think you know how Left Behind ends, there are plenty of surprises and insights into who Ellie is. Fans of The Last of Us will not want to miss this new chapter that ties directly into the main story.

The Last of Us: Left Behind drops tomorrow at 6.00am GMT globally! At that time it’ll be available on the PlayStation Store in your region. It’s a hefty 5GB so get ready early to download and be the first to play it!

Watch the clip below.