CGI animation. Ernie, controller of International Underground, is always on hand to help his friends and to get passengers to their destinations safely. He is helped by trains Victoria, Bakerloo, Circle, Jubilee, the twins Hammersmith and City and Ernie's friends Millie and Mr Rails. Millie wins a Win Your Dream Day competition in the Tunnel Times. Unfortunately the prize is a day on International Underground. She is disappointed, but Ernie and the trains make sure her day is really special.