It's beginning to look a lot like Christmas in Springfield, but while Marge gets in the holiday spirit, it's bah humbug for the rest of the family. Disappointed that she is alone spreading the holiday cheer, Marge sends a letter to Martha Clause to help her save the family Christmas. Martha comes to the rescue and transforms the house into the North Pole chalet Marge has always dreamed of, but when the family is noticeably absent from the perfectly trimmed holiday home, she realizes that it's Homer and the kids who make the holidays special. Meanwhile, the Simpsons get ready to sneak away for a tropical holiday vacation in Hawaii, but surprise visitors Mr. Burns and Moe's new friend, Katy Perry delay their getaway. Four special holiday tales will be spun.

After the fourth graders and fifth graders engage in a heated dodgeball battle, Bart discovers that one of the fifth graders has the same mysterious scar on his hand. Puzzled by the matching blemishes, Bart tries to understand why and how he got it, leading Marge to explain that seven years ago, she and her girlfriends formed the "The Cool Moms," a tight-knit group of moms who set playdates for their young boys. Inspired to reconnect with the women, Marge's social life soon becomes recharged, but when Bart's playdates stop being fun, he attempts to break up the club, and Marge finally remembers why she left the group in the first place. Blackboard: 'January is not Bart history month'.