Sierra is a human charater.
Sierra is a kind young girl. She is 13 years old. Her best friend is Jacob . She is also friends with Kira, Cassie, and Caroline, Jacob's little sister. Her favorite colors are yellow and red. Her favorite engine is Rosie .
The Search For the Controllers Part 2
The Search For The Controllers Part 3
Jacob's Unlucky Day
Rosie, Jacob, Sierra, and the Troublesome Trucks
Home Sweet Home
The Best Start To Summer
Jacob and Rylie's Blue Mountain Adventure (does not speak)