In The Vampire Diaries Season 4, Episode 23, “Graduation,” ghosts arrive in Mystic Falls. Some are there to make trouble, but an unexpected hero comes to fix things. Damon has a ghost after him, while Rebekah and Matt battle one of the undead who's after the cure. Caroline gets a special gift and is determined to make graduation happen. Bonnie may close the veil between this world and the Other Side, but Silas isn't done yet. Stefan discovers something shocking about him. Elena comes to a conclusion about Stefan and Damon and encounters Katherine (Nina Dobrev) in an “epic” meeting.