This discussion may contain spoilers!
I was tied between Citizen Brown and Outatime for my favourite episode but i picked Citizen Brown because i liked the idea where theres a timeline that while it looks perfect it is really horrible and it turns out Doc has been well kind of brainwashed because Edna convinced him to make all these rules and turn Hill Valley into a police state and Marty is alone here. Jennifer thinks he is a nerd, his parents are fighting again, George is now a wimp again. Biff has now been brainwashed by Edna and Doc now thinks hill valley should be the way it is now until the next episode. Now some people might think that it should be Outatime because it had better puzzles than this episode but the story had me worrying about Marty and Hill Valley throughout this episode and i loved the cliffhanger at the end [spoiler] where Marty & Doc is captured by Edna to be brainwashed [/spoiler]