S2, E18: Desperate to find a way to vanquish Dahlia (recurring guest star Claudia Black – Farscape), Klaus soon finds himself face to face with another deadly threat: Mikael (recurring guest star Sebastian Roché). Meanwhile, as Hayley and Rebekah (recurring guest star Maisie Richardson-Sellers) work with Freya (recurring guest star Riley Voelkel) to track Dahlia's whereabouts, Elijah and Marcel prepare a safe house in Algiers with the help of Josephine (recurring guest star Meg Foster). Elsewhere, determined to protect Hayley and baby Hope, Jackson (recurring guest star Nathan Parsons) approaches Hayley with a risky idea that leaves her conflicted. Finally, Aiden (recurring guest star Colin Woodell) finds himself torn between his loyalty to Jackson and his secret alliance with Klaus.