S2, E21: After discovering that his own siblings have betrayed him, Klaus teams up with an unlikely ally and sets off on a warpath, hell-bent on revenge. Amidst the news that Klaus is on the loose, Elijah, Rebekah (recurring guest star Maisie Richardson-Sellers) and Freya (recurring guest star Riley Voelkel) move forward with their plan to lure Dahlia (recurring guest star Claudia Black) to the compound and take her down once and for all. Meanwhile, Hayley and Jackson (recurring guest star Nathan Parsons) attempt to escape through the flooded bayou, even as Marcel finds himself hunted by a dangerous new threat. Finally, Davina is presented with an offer that could allow her the chance to bring back Kol, though it will require her to make a life-altering decision.