[s4e5] I: Hear You Knocking

" 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

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

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

The Hollow anchors itself to the living world by exploiting the darkest fears and past traumas of powerful supernatural beings.