S2, E20: Damon is willing to go to extraordinary lengths to prevent Elena from being a victim of Klaus’s (recurring guest star Joseph Morgan) plan to break the curse. Damon’s actions put him at terrible odds with Stefan and the tension that started brewing between the brothers over their differing opinions of how to help save Elena’s life blows up into a full-scale conflict. Tyler returns to Mystic Falls after receiving a disturbing phone call. With the full moon marking the arrival of the sacrifice ritual, Stefan and Elena spend a romantic day together … afraid it might be their last.