When Joe invents a new super battery, it catches the attention of Professor Polonium and her trusted but rather silly sidekick Dr Crumpton.

Through mud, garbage, and muck, Thomas and his engine friends show that being really Useful can be a dirty job! See James turn into the Really Muddy Engine, and Thomas…

When Fireman Sam performs a super-heroic rescue, he is awarded a special bravery medal and offered a new job in Newtown by visiting Chief Fire Officer Boyce. Meanwhile, a Pontypandy…