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. Tunnel Times is doing a feature on the International Underground and Ernie is asked to take the pictures. Only the coolest trains get to be on the cover.