Batman: The Animated Series S01E26 - Perchance to Dream

Bruce Wayne wakes up one morning to find that his life is completely upside-down: his parents are alive, the Batcave does not exist, Alfred does not remember Robin, and he is engaged to Selina Kyle. However, it doesn't mean that Batman isn't still around, and Bruce starts to wonder what has happened, especially after seeing the characteristics of a dream (such as book and newspaper prints not making sense) inside this new life.