: Caroline Forbes is hospitalized after her car accident. Damon uses his vampire blood to heal her. At the end of the episode, Katherine smothers Caroline with a pillow, killing her while the vampire blood is in her system to trigger her transformation into a vampire.
: After impersonating Elena to attack John Gilbert and kiss Damon in the previous season finale, Katherine's presence is quickly deduced by the Salvatore brothers when the real Elena denies these actions. The Vampire Diaries Season 2 - Episode 1
: Katherine tells Stefan she returned specifically for him, but when rejected, she stabs him with a metal bar. Later, she brutally rejects Damon, telling him she never loved him and that "it was always Stefan". : Caroline Forbes is hospitalized after her car accident
: Spiraling from Katherine's and Elena's rejections, a drunken Damon snaps Jeremy Gilbert's neck in front of Elena. Jeremy survives only because he was wearing the Gilbert ring, which protects against supernatural death. : After impersonating Elena to attack John Gilbert