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 recurrently played a 500-year-old doppelgänger vampire named Katherine Pierce. She played the Petrova dopplegänger progenitor Amara, also known as the world's first immortal, in season 5. She crossed over to The Vampire Diaries spinoff The Originals, as doppelgänger 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.