An H.T.U.V. internal affairs agent who initially exposes Lance Sterling as a supposed traitor. She pursues him and Walter throughout their journey, attempting to persuade Walter to help capture his friend. Her suspicions grow when she witnesses the true villain using a robot hand, and she eventually allies with the duo to stop the drone attack.
Marcy gradually identifies evidence that distinguishes Killian from Lance.
Marcy's suspicions about Lance change after she sees the real villain using a robot hand while disguised as Lance.
Marcy treats Lance as a suspected traitor before the deception is exposed.
Marcy reveals the footage accusing Lance of treason and pursues him and Walter through the city and in Venice.
Marcy pressures Walter to cooperate with H.T.U.V. during the manhunt.
In Venice, Marcy refers to Walter's mother Wendy and tries to convince him to help turn Lance in.
Marcy invokes Wendy's memory to influence Walter's decision.
Marcy knows about Wendy and uses knowledge of Walter's late police-officer mother while trying to persuade him.
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