So I thought of a cool extra episode idea that could be made for Halloween next year. First off this is not about season 6. Think of it as episode 3.5. Basically the episode revolves around the 6 months that it took for FCB to fix the time machine.
Enda turn the whole town into "zombies" to capture Marty and Doc. Marty needs to help Doc fix the time machine so he could go back in time to get Marty and bring him to 1931. You need to save Doc because he is captured and must make sure that he fixes the time machine while avoiding the mind controlled citizens who are trying to turn him into one of them.
With everyone being mind controlled and acting like zombies it would make a great special Halloween episode. What do you guys think.