Prior to the release of the Left Behind DLC, the first The Last of Us (not to be confused with The Last of Us Part I) consisted of two parts: the prologue and the main story. In the prologue, players get to view the apocalypse as it is happening through the eyes of Joel's daughter Sarah. Amidst all the chaos and confusion, they also see Joel not as a survivor, but as a father. This is a stark contrast to when players take control of Joel in the main story, as he has acclimated to the post-apocalyptic world and now works as a smuggler.
Between these two time periods is a lot of character development. After the death of Sarah, Joel and his brother Tommy must have escaped their home city of Austin, Texas, and found a way to survive for 20 years. There are a lot of references to this time, so much so that creating a The Last of Us game centered on the middle-aged brothers would be feasible.
The Last of Us Part 1 Review
Whenever Joel or Tommy speaks of the time they spent surviving together, they look at it with disgust and disdain. Joel indirectly tells Ellie about when he used to be a hunter — someone who tortured, tricked, and killed innocent people out of their belongings just so he (and potentially Tommy) could survive. This is how he knew about the ploy a group of hunters was playing on him and Ellie as they entered Pittsburgh. As for Tommy. players see him talking to Joel about how he still has nightmares from the years he and Joel spent «surviving» — alluding to the unspeakable things they did. The guilt and disgust that Tommy felt toward Joel's way of life led to him leaving Joel and joining up with the Fireflies. But even that relationship didn't last, as players see Tommy has deserted the Fireflies in The Last of Us
Read more on gamerant.com