Nightmare in Silver

The Eleventh Doctor takes his companion, Clara Oswald, and her wards, Angie and Artie, to the biggest amusement park in the galaxy, Hedgewick's World of Wonders. However, the theme park is empty, occupied only by a "punishment platoon" and a lone impresario with empty Cyberman shells as exhibits... or so it seems. When the Doctor decides to stay a while to investigate strange insect creatures that are roaming the park, he soon discovers that these insects are really machines seeking to convert the life forms on Hedgewick's World into the newest generation of the ever-upgrading menace...