2.15 - The Dinner Party

After confirmation by apparently terrified Katherine that the single ash-bound knife can kill an original vampire, Damon invites Elijah, her maker, to a dinner party to stab him. Alaric however finds out a nasty limitation to that method. Meanwhile Stefan tells Elena about the time when he was the vicious vampire, Damon tried to be good, and John Gilbert played a surprisingly positive part. Jeremy can't prevent 'immature' witch Bonnie being questioned and suitably punished by accomplished Luka.

Source: IMdb