Though Spike has learned who he is with help of the Great Dragon Migration, he is still left with the question of what he is. Accepting that his personality is different from that of his own kind, but now seeing that there are more physical differences that can not be ignored.
Just as before, Twilight's vast knowledge is unable to help. But, when the purple dragon learns of an old dragon of legend who shares similar differences, he is determined to learn more, With the help of his friends, Spike sets off to follow this dragon's ancient wake, his hopes high to find some scrap of insight into his existence.
But with so many uncertainties, will Spike find the answers he seeks, or will the disappointment of failure crush his resolve forever?