: Agravaine continues his role as a mole, gaslighting King Arthur into believing that Gaius is the traitor within Camelot's walls.

If you are looking into the literary origins, this 1910 short story is a staple of psychological fiction.

In this 2011 episode, the central conflict revolves around Morgana’s desperate quest to uncover the identity of "Emrys" (Merlin’s true self).

If you were expecting a Star Trek guide for a Season 4, Episode 7, the corresponding episodes are: "Merlin" The Secret Sharer (TV Episode 2011) - IMDb