Sue's "Nazi-hunting" mother, Doris shows up in Lima to check in on her girls. Meanwhile, Kurt makes an important decision after getting pushed to his breaking point, and Rachel and Finn take a big step.

Finn tries to bring a little holiday cheer to McKinley High, and Artie discovers that Brittany still believes in Santa. Meanwhile, the teachers pick their Secret Santas, and one manipulative coach rigs the gift-giving in her favor.