Underground Ernie is a 2006 British animated children's television series produced by Joella Productions for the BBC on both CBeebies and BBC Two, and sold internationally by BBC Worldwide. It is set in International Underground, a fictional worldwide underground railway network, based on the London Underground, and focuses on the everyday adventures of Ernie, a friendly underground supervisor, Millie, his multilingual colleague, and Mr. Rails, the lovable maintenance man.

John Deery is a British-Irish award-winning film and television drama director, screenwriter and producer.