Demo Day is the twentieth episode of the ninth season .
Jacob, Sierra, and Kira convince Mr. Hatt to let then hold Sodor's first ever demolition derby.
- This episode was originally going to be the twentieth episode of the second season. It was then moved forward become the eighteenth episode of the second season, then to the nineteenth episode of the ninth season, and finally to the twentieth episode of the ninth season.
- Each of the demolition derby cars' appearances is based on that of an engine.