When Penny Proud’s rant about Wizmas and the commercialization of Christmas causes Santa to quit on Christmas eve, Penny finds herself guilted into putting on the red suit and replacing him. And in the process of delivering Yuletide cheer with the help of Santa’s irreverent elves, she discovers that indeed the Christmas spirit is still alive.

After losing their mothers at a young age, Diamond and her closest cousins, Tia and Tara, known as "Sisters", are willing to do anything to keep their grandmother from dying of cancer and save their family.