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. Circle stops off at the nature reserve and discovers that Pippa's cat Patch disappears during a thunderstorm. Bakerloo is experiencing strange goings-on too, as he spots a pair of glowing green eyes. Show less