Vampire Diaries season 3 Episode 17

Damon finds the way to kill the originals with the help of Sage. However, Sage finds out that the Originals are linked and that Finn will be killed as well, so she betrays Damon. Alaric attacks Meredith, but luckily Stefan and Elena arrive in time. Bonnie's mother leaves after losing control and attacking her "son". Bonnie heals Alaric and Stefan and Damon find another way to kill the Originals at the end of the episode.