It's Christmas in the Harper household and as expected, chaos ensues; Janey has some shocking news; Nick is up to his usual antics; Susan is trying out a new Christmas recipe.

The Harpers are on their way home from a Christmas shopping trip when the metro grinds to a halt. All sign of seasonal goodwill evaporates as the passengers wonder just how long they will be stuck underground.

Sitcom. It is December 2039, and the Harpers are gathering together to celebrate Christmas. However, there may not be too much room for peace and goodwill.