Millie is the computer expert working alongside Ernie in the Underground control room. Outside of work she loves travelling and takes the chance to go abroad every weekend.
Millie knows everything there is to know about computer technology and has a passion for all things international. Every weekend she goes abroad to another country and brings back souvenirs for Ernie and Mr Rails. While she is very proficient, without Ernie to help her she can sometimes find the work very hard and stressful. However, she always knows when to ask for help and is a valued member of the team.
Millie wears a light blue shirt with a blue vest and trousers, with her name badge on it. She wears brown shoes.
Series 1 - Pop Decoy, Sir Clunkalot, Mr Rails Never Fails, Brooklyn and Rocky Two-Shoes, Pulling Together, Caught Purple Handed, Ernie's Big Trip, Finders Keepers, The Magician's Assistant, Cover Story, Millie's Dream Day, Mr Movie Jones, Summer Breeze, Running Late, Light At The End Of The Tunnel, The Wreck Of Sea Shell Bay, Catnapped, Monster Mystery, Bon Appetit, A Change Is As Good As A Rest, Elementary, My Dear Bakerloo!, The Magic Lamp, How Great The Art, The Mayor's Visit, Techno Trouble, Snow Go