Tara Thornton does something she never thought she'd do, save one of the living dead. Now she's being hunted by the Authority. Eric Northman, the former Sheriff of Area 5, is the only one who can protect her--that's if she agrees to give him what he wants in return. During S4E9 - LEMONS Galore

Kol turns Bonnie into an upgraded Original to protect her from a certain siphon problem..

The best Doctor Who speeches in my opinion......