Mike heads to MotivePower in Boise, Idaho to build and restore locomotives for his 200th dirty job.
Mike goes to Hawaii to learn how to make dirt shirts at The Original Dirt Shirt Company. Then he heads off to Reno, Ohio to learn how to make marbles.
Mike travels to Michigan where he gets downright filthy working at a bone black plant. Then he meets with twin sisters who are big fans of the show to discuss the top five dirtiest jobs Mike has ever done.