Episode: 2x20 (Season 2 Episode #20) Aired: April 28, 2011 The Last Day Plot: Damon is willing to take extreme measures to prevent Klaus from harming Elena. His actions pit Damon and Stefan against one another, and the tension that started brewing between the two over their differing opinions of how to protect Elena turns into a full-scale conflict. Tyler receives a concerning phone call and returns to Mystic Falls. With the full moon marking the arrival of the sacrifice ritual, Stefan and Elena spend a romantic day together, worried that it might be their last.