During a battle, Brac's ship is about to crash onto a planet. He gives in to the urge to eject, only after noting his ship will destroy a nearby building. The annual UNIT Christmas party is interrupted with news of a UFO. The Brigadier leaves, and several others follow. Before Harry can do so, an alien ship crashes into the building. Harry and Sarah are trapped under the rubble. Meanwhile, Sarah and Harry swap "worst Christmas" stories. They have enough air to breathe, but they don't know if anyone else survived the crash. Harry tries to keep Sarah's spirits up.