|Primary wardrobe||Mint colored nightgown|
|Age||8 to 9|
|Location||Grand Rapids, Michigan|
|Motion capture|| Leslie Zemeckis (primary)|
Ashly Holloway (additional)
Sarah is Hero Boy's younger sister.
In the beginning of the film, Hero Boy goes down stairs to see if Santa Claus has come, but sees no presents under the tree. Suddenly, he sees a shadow of Santa, but it turns out to be his father carrying Sarah after he puts her down. Hero Boy runs back to his room to avoid being seen and watches Sarah get tucked into bed through the key hole. While doing so, Sarah talks to her parents about what a friend told her about Santa, saying he would have to travel faster than light speed in a sled larger than an ocean liner in order to deliver so many presents in one night. Her parents assure her that he was just joking and that Santa will come, but only if she goes to sleep.
Right before Hero Boy boards the train, the Conductor mentions that Hero Boy made Sarah put out the milk and cookies for Santa.
The next morning, Sarah excitedly wakes up her brother, telling him that Santa has been to their house. When he gets up, she goes to wake up her parents. They are soon downstairs opening their presents when she finds one small present behind the tree that is for her brother. He opens it up to find the silver bell he received and lost last night. They each rang the bell and enjoyed the sound it made. However, their parents could not hear it due to not believing in Santa. They simply assumed it was broken.
At the end of the story, the narrator mentions that Sarah was able to hear the bell for years, but she eventually finds one Christmas when she could no long hear it, like most of Hero Boy's friends.
- In the book, Sarah does not appear in the beginning of the story, only at the end.
- Sarah is the only major child character in the film who did not ride on the Polar Express.
- "But he said Santa would have to fly faster than the speed of light to get to everyone's house in one night, and to hold everyone's presents, his sled would have to be bigger than an oceanliner."
- "Wake up! Wake up! Santa's been here! Santa's been here!"