In France, Loopy meets the four musketeers and one of them goes to rescue a princess and Loopy goes with him to see him in action.

Can a philosopher's stone turn everything in life to gold? Can it become the elixir of life?

The traintastic crew are back on the rails. Trainee engines Koko, Wilson and Brewster with their young friend, Zephie and new trainees Hoot and Toot, try to keep everything rolling smoothly,but their curiosity and good intentions often signals trouble on the tracks...