Jacob Marley appears as a tormented ghost on Christmas Eve, precisely seven years after his death. As the deceased former business partner of the protagonist, he drags heavy chains forged from cash boxes, padlocks, and ledgers, symbolizing the greed and indifference that defined his existence. These chains embody his moral failures and the crushing weight of his neglected responsibilities toward humanity.

Marley's spectral visitation delivers a dire warning to his surviving partner about the consequences of continuing a life of selfishness and isolation. He explicitly states the protagonist faces an even more agonizing afterlife unless he embraces the offered chance for redemption. To enable this transformation, Marley orchestrates the arrival of three spirits tasked with guiding the protagonist through self-reflection. His dialogue underscores themes of accountability, declaring "mankind should have been my business" and lamenting his past neglect of charity and compassion.

Though Marley expresses deep remorse for his earthly actions, his ghost remains condemned to wander restlessly, witnessing human suffering without the power to intervene. This eternal punishment reflects the narrative's moral framework concerning the urgent need for repentance and social responsibility. His role is strictly confined to this single intervention, initiating the protagonist's supernatural journey before departing the story.