I saw a TV movie years ago (don’t remember the title) about an Elvis impersonator who travels back in time and meets Elvis just before he made his first recording at Sun Records. The two end up getting into a fight, and he accidentally kills Elvis. Realizing what he’s done, the impersonator tells himself that there cannot be a world without Elvis Presley in it, so he decides to take his place, does the recording session at Sun, and lives the rest of his life as the person that everybody thinks was the real Elvis Presley.