Percy breaks down when delivering the mail at night. While Thomas is pushing him back to the sheds, Percy sees some flashing lights in the sky and is convinced they are a spaceship. Gordon teases Percy, so when Thomas is sent to deliver the mail for Percy he becomes determined to prove his friend was right. Thomas spots some lights in the distance but they turn out to be workmen repairing the track. He spots some more lights, but they turn out to be the lighthouse. A third set of lights turns out to be Jeremy! Thomas realizes that Percy must have seen Jeremy landing at the airport! Searching for the spaceship makes Thomas late. Back at the sheds, he explains the truth about the lights to Gordon. And even though Thomas felt silly, he asks Gordon to help deliver the mail on time. Gordon is pleased to help and Percy decides that Jeremy is better than any spaceship! A successful day of deliveries in the snow convinces Henry that he has lucky trucks. The next day, without realizing, Edward uses Henry's trucks to take coal to the villages. Henry is given an important special - to collect presents for the children. Henry tries but finds his job difficult without his lucky trucks. Henry searches for Edward and the lucky trucks - but when he finds him Henry accidentally smashes the lucky trucks! Henry remembers the presents for the children he stops thinking about the trucks and puffs on without them. Soon Henry delivers all the presents. The children are delighted and Henry feels like the luckiest engine of all!