What is the name of the survivor who helps Dexter in season 5?

The survivor who helps Dexter in season 5 is Lumen Pierce.

Lumen is introduced after Dexter kills Boyd Fowler, a serial offender who has been holding her captive. She witnesses Dexter’s murder of Fowler and initially fears that he may harm her as well. Instead, Dexter helps her escape and discovers that Fowler was only one member of a group that abducted and tortured her.

Lumen asks Dexter to help her find the other perpetrators, including Jordan Chase. Their partnership becomes the central story of season 5: Dexter supplies investigative experience and knowledge of his code, while Lumen seeks revenge and emotional release. Her targets are not random; Dexter insists on confirming their guilt before they are punished.

A common mix-up is confusing Lumen with Hannah McKay, Dexter’s later romantic partner, or Lila Tournay, his volatile season 2 associate. Lumen’s storyline is unique because she is a survivor whom Dexter helps rather than a killer he initially hunts.