With the first installment, The Last of Us captivated the audience, and this enticed even more people to see the second installment. According to Nielsen data, the second episode achieved a new high in viewership.
The second installment of The Last of Us has been premiered in the United States by 5.7 million viewers, up 22 percent from the premiere's 4.7 million viewers. This means that a certain number of viewers who hadn't immediately seen the first episode didn't wait until the second one became available.
This growth is the largest ever for an HBO Original drama series and illustrates how popular HBO's The Last of Us is. According to HBO, the viewership of its programs accounts for between 20% and 40% of total viewership, so even episode two has plenty of room to grow to 2.5 to 5 times its present viewership.
As the second episode receives fantastic reviews, the third episode with Bill is already available.
If you don't want any spoilers but you want to know more about The Last of Us's world, here's a report on what the show's creators imagined in Tess's past, which isn't included in the TV series or in the game.