How would the world look if the Industrial Revolution never happened and petroleum energy was never developed? Far, far more environmentally ravaged than it is today.
In this steampunky alternate universe, that steam power comes from trees and there are not a lot of them left. How did things get so bad? A mysterious agency has been abducting scientists, halting progress in its tracks.
It is pretty cool to see a film suitable for family viewing reference the Franco-Prussian War and provide cameos for scores of scientists, including Einstein and Fermi.