American teen drama show Euphoria is now HBO's second-most-watched show since 2004 behind only Game of Thrones, per the pay TV channel. The Zendaya-led drama hit yet another series high with its Season 2 finale episode Sunday, drawing 6.6 million viewers.

According to HBO, Euphoria Season 2 episodes are now averaging 16.3 million viewers, the best performance for any season of an HBO series over the past 18 years, other than Game of Thrones.

To date, the Season 2 premiere's viewership is approaching 19 million viewers in the US, reports variety.com. Euphoria was once again the top title on HBO Max in the US for the seventh week in a row, as well as the top series for the week in both Latin America and Europe.

Euphoria's per-episode-viewership average was already up nearly 100 percent from its first season after airing just its first four episodes of the second season. The show also hit a new series high when it aired opposite Super Bowl LVI on February 13.

Euphoria is also now the most-tweeted-about show of the decade — so far — in the US with 34 million tweets. Euphoria Season 2 centres on the intertwining lives of high schoolers in the town of East Highland, where 17-year-old Rue (Zendaya) must find hope while balancing the pressures of love, loss, and addiction. The finale episode saw many of the season's biggest conflicts come to a head -- more than one in a violent fashion.

The series stars Zendaya, Hunter Schafer, Nika King, Eric Dane, Angus Cloud, Jacob Elordi, Algee Smith, Sydney Sweeney, Alexa Demie, Barbie Ferreira, Maude Apatow, Javon Walton, Dominic Fike, Storm Reid, and Austin Abrams.