This is Mr. Ebenezer Scrooge. He is selfish, mean, and rude. He hates Christmas, and could care less about everyone else. He even makes his employees work on Christmas Day!
One day the Ghost of Christmas Past came to Scrooge. He came to Scrooge to show him how he (Scrooge) had acted in the past, and to show him why he (Scrooge) might be the way he is now.
The Ghost of Christmas Past shows Scrooge things from his past. The Ghost shows him how he acted towards people and how he was alone on Christmas, which might be why Scrooge does not like Christmas now.
Then the Ghost of Christmas Present came to Scrooge. The Ghost took Mr. Scrooge to see Bob Cratchit, Scrooge's employee, on Christmas night. Scrooge saw how the Cratchits' were living in poor conditions, and realized the money he gave Bob wasn't enough.
The Ghost of Christmas Future also comes to Scrooge and shows him that if he continues being mean to everyone that karma will stab him in the back. If Scrooge keeps being selfish bad things will happen.