The Doctor takes Tegan and Turlough to Earth on Christmas Eve in the 21st century so they can do some Christmas shopping. As Tegan heads off on her own, the Doctor and Turlough agree to concentrate on gifts for Tegan, though neither has an idea what to buy for her. They separate. Tegan finds a sock and tie set for Turlough, then sees a compass that looks like a fob watch in a jewelry store. When she tries to pay for it, some of her money is no longer in circulation, and the jeweller won't take her credit.