Shawn investigates the disappearance of a mummy from the National History Museum.

It's Christmas in South Park once again. This year Stan, the boy with the red poof-ball hat, finds himself helping out a group of adorable critters that live in the forest. They ask him to help protect their pregnant friend, who will give birth to their Lord's son. Everything is going well until Stan learns who these critters worship.

Death grants Peter's wish to go back in time to 1984 when he was 18, but only for one night. He ends up bailing on a date with Lois to hang out with a movie actress. When he returns to the present, he soon realizes that everything is anything but normal, as he is now married to the former actress, and Lois is with Quagmire. Meanwhile, Stewie, Chris and Meg have also taken on Quagmire's charming characteristics.

Robert and Amy exchange vows in a classic Barone family wedding ceremony.

Rory finally learns her mother can't afford to buy the Dragonfly Inn since financial aid for Yale didn't come through. She decides to take matters into her own hands with a quick visit to her grandparents right before graduation. Luke has second thoughts about a trip with Nicole after something Lorelai tells him. Jess makes silent contact with Rory after her graduation ceremony from Chilton.

As the wildfire approaches, everyone must evacuate. Nancy tells her family to pack up, while Conrad and Heylia must say goodbye to the growhouse. The authorities question Sullivan and Celia, while Shane continues to ask Nancy about Pittsburgh. As Andy deals at the evacuation center, Silas realizes the truth about Tara.