Runaway Engine

Runaway Engine is the fifth episode of the twenty-first season.

Plot
Millie is given extra work around the estate and gets very cross when Stephen and Glynn forget to clear up the garden waste to help her. When Stephen also manages to hurt her feelings and can't find her the next day to apologise, he thinks that she must have run away!

Characters

 * Stephen
 * Glynn
 * Skarloey
 * Luke
 * Millie
 * Sir Robert Norramby
 * The Grumpy Passenger
 * Sir Handel (cameo)
 * Mr. Bubbles (cameo)

Locations

 * Ulfstead Castle
 * Blue Mountain Quarry
 * The Dinosaur Park
 * Crovan's Gate (mentioned)