Saga, Series or Serial

Okay so at times my brain goes in a million different directions. This is a good example. I am writing some of the promotion copy and am caught between three terms. As I explain you will realize why we cannot or should not use all three, even though it would be fun to tangle up tongues and confuse people. A saga is a long story of heroic achievement. That definitely describes the New Earth Series. That is what we will call term 1. A Series is of course a set of books published with a common format, title, and characters. That also describes The NewEarth books, so we should call that term 2. A serial is taking place in a series, as in a story within a larger story which also applies to My NewEarth Saga. This is why I considered calling NewEarth a serial series that forms a Saga of giant proportions. To many sssss’s everyone says. What do you think?