[s4e5] I Hear You Knocking -

The episode also marks a significant shift in the relationship between Freya Mikaelson and her captive-turned-ally, Keelin.

: Marcel is haunted by visions of Elijah and Klaus, who goad him to finally seize his revenge against the Mikaelson family for their centuries of betrayal. [S4E5] I Hear You Knocking

While the men battle their demons, Hayley Marshall uncovers chilling details about her own lineage through Mary. The episode also marks a significant shift in

: The Hollow manifests as his abusive father, Mikael. These hallucinations taunt Klaus, suggesting he is weak and that the only way to protect his daughter, Hope, is to revert to his most brutal, murderous self by killing Marcel. : The Hollow manifests as his abusive father, Mikael

Watch the official inside look for this episode to see the producers discuss the Hollow's psychological grip on Klaus and Marcel:

: Hayley discovers that her parents were murdered by Mary’s husband while he was under the influence of the Hollow.

: A link is revealed between the Hollow's dark magic and Hayley's former wolf pack, suggesting that the ancient evil has been targeting her bloodline for generations. Emerging Dynamics: Freya and Keelin