The Vampire Diaries
The series premiere of "The Vampire Diaries" on September 10, 2009, gave The CW its biggest series premiere, scoring 4.91 million viewers. Adding in DVR numbers, the ratings for the premiere swelled to an official 5.7 million viewers. In 2016, a "New York Times" study of the 50 TV shows with the most Facebook Likes found that "as with several other shows that focus on the supernatural", "The Vampire Diaries" was "slightly more popular outside of cities. That said, the show's fandom has the smallest amount of spatial variation of all 50 shows".
Nina Dobrev
Dobrev left "Degrassi" in 2009 to star in The CW's supernatural drama series "The Vampire Diaries", a television adaptation of the book series of the same name, playing the lead role of Elena Gilbert. Dobrev also played a series of dopplegangers of Elena on the series, most prominently 500-year-old vampire Katherine Pierce. She crossed over to "The Vampire Diaries" spinoff "The Originals", as doppleganger character Tatia, in an episode in 2014. In April 2015, Dobrev announced via Instagram that she would be leaving "The Vampire Diaries" after portraying Elena for six seasons. In January 2017, it was announced that Dobrev would return as Elena and Katherine in "The Vampire Diaries" series finale.