" I Hear You Knocking " is the fifth episode of the fourth season of the CW series , which originally aired on April 14, 2017. This pivotal hour serves as a psychological deep dive into the show's two most complex power players, Klaus Mikaelson and Marcel Gerard, as they are forced onto a violent collision course by a malevolent entity known as The Hollow . Psychological Warfare: The Hollow’s Manipulation
: 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 [S4E5] I Hear You Knocking
: Though the intended sacrifice failed, the Hollow accepts Marcel’s blood and grants his allies a magical thorn capable of killing an Original. " I Hear You Knocking " is the
: 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. Emerging Dynamics: Freya and Keelin : Though the
The episode also marks a significant shift in the relationship between Freya Mikaelson and her captive-turned-ally, Keelin.