Symbol - Season 1eps10: The Lost

: Mal'akh takes Katherine to the tunnels beneath the Washington Monument , planning to use the "Cascade" resonance device to achieve apotheosis (becoming a god) through a ritualistic human sacrifice.

: As the resonance device begins to threaten the structure of the monument, Nuñez manages to disrupt the machine. The Lost Symbol - Season 1Eps10

: Robert and Katherine decide to take their relationship slow, with Robert returning to his academic life at Harvard. : Mal'akh takes Katherine to the tunnels beneath

: Robert Langdon intervenes, shattering Mal'akh’s delusions by revealing the true nature of the "ancient wisdom." In the ensuing struggle, Katherine stabs Mal'akh with his own sacrificial dagger to save Robert, and Mal'akh dies in Peter’s arms. The "Lost Symbol" Revelation : Robert Langdon intervenes

: Peter Solomon arrives, intending to sacrifice himself to save Katherine. However, Mal'akh reveals he wants to be the one sacrificed by his father's hand to be reborn in a higher form.