There are three series of novels based on the Stargate franchise, one based on the original "Stargate" film and two based in the "Stargate SG-1" and "Stargate Atlantis" television shows. A series of books written by Bill McCay was published from 1995 to 1999 that were unofficial sequels to the film. These were produced by consulting the original notes made by Dean Devlin and Roland Emmerich, in an attempt to envision where the film "would have gone". Neither party has commented on whether McCay's interpretation was correct. Despite attempting to remain close to the original vision, the subsequent television series "Stargate SG-1" (which began under an entirely independent development) developed the story along different lines, making no attempt to reconcile the plot lines of the books. This marked the first major branching of the franchise.