Destiny is a series published by IDW Publishing. It serves as both a sequel to The Reign Of Starscream and as a lead in to Revenge of the Fallen, and as such is in direct continuity with the film. Destiny consists of two four-issue story arcs: the first arc, Alliance, began in December, 2008, while the concurrent arc Defiance debuted the following month.
Initially, Chris Mowry was asked to do a prequel series for Revenge of the Fallen. The theme of "destiny" was key, so that's what the title was called. Eventually, the staff of IDW felt that since there is so much to tell in the movie universe, there should be two separate series. So while there are two stories, they fall under the "destiny" banner and help to explain a larger story.[1]