Answer
Jacob Marley's ghost was portrayed by Alec Guinness in the 1951 film adaptation of Charles Dickens' "A Christmas Carol." Guinness's performance brought depth and nuance to the character, capturing Marley's tormented spirit and his desire for redemption. Through Guinness's portrayal, Marley's role as a cautionary tale for Scrooge became even more impactful, highlighting the consequences of greed and selfishness.