A series of stories can only stand on strong foundations, built from the ground up. Boundless sums of money have been wasted attempting to create shared story universes where no such right has been earned. A multi-part series of stories can only exist when its constituent stories are entertaining, when they develop likeable characters, and most importantly, are self-contained. Build investment in your characters, then put them through hardship, and finally allow them to achieve catharsis. Once again, you must master the art of controlling potential energy—the longer the tension is drawn out, the more satisfying the feeling of catharsis upon its release.