HBO's 'The Last of Us' has some key differences from the video game. Here's how they compare.

• "The Last of Us" takes place in a post-apocalyptic US after a mutant fungus leaves the world in chaos.
• The show is very faithful to the game so far, but there are some key differences.
• The third episode especially diverged from the game and added backstory for two characters.

This post contains spoilers for both the "Last of Us" video game and the HBO series.