Flying Spaghetti Monster wrote:
I looked for "the other Marty" on my blue ray, but I don't see him. Can someone use a screen shot and circle him?
He's not there.
Correct. That theory is from the old VHS days. When a person could not clearly pause on a frame.
Its a classic case of believing you saw something because you want to think you are clever. Those articles predate the release of Part III. This was part of a theory that at the end of Part III Mary would learn he had been replaced in 1985 by this "other Marty". So he could not return to his normal life and would continue to time travel with Doc. Hence a setup for more sequels. Obviously none of that turned out of be true!