The ghost of Christmas past is an ethereal figure who leads Ebenezer Scrooge through a series of visions to re-examine his past and gain a deeper understanding of how his actions have shaped his life. With the ghost's guidance, Scrooge is able to see how his past choices have led to his current predicament and the potential consequences of continuing down the same path. Through this reflection, Scrooge gains a new perspective on life and a renewed appreciation for the power of kindness and generosity.