Christmas should be a wonderful time.
Mean old Scrooge says, "Humbug," when anyone mentions Christmas. He doesn't like giving money away and he resents giving his clerk Bob Cratchit the day off to spend with his family. The Cratchits don't have money to spend on presents, but they would never dream of not celebrating Christmas -- especially the youngest, Tiny Tim.
Alone in his dreary rooms on Christmas Eve, Scrooge is visited by some ghostly spirits. He gets a chance to see what Christmas would be like in the future -- for him and the Cratchits -- and he gets a chance to change things if he wants to.