Katherine Pierce (Nina Dobrev) is back in Mystic Falls, haunting and hunting in the shadows, and our heroes have a plan to lure her out of hiding once and for all for the show's penultimate episode. After Friday's installment sappily re-upped Stefan (Paul Wesley) and Caroline (Candice King)'s engagement, just as the keys to Hell were handed to Katherine, the gang's plan to get Steroline hitched at long last is formed and they'll need to make it the happiest set of nuptials to ever grace the town if they want to get Ms.