-Crossing+of+the+Threshold

Crossing of the Threshold: Where the main character goes from World one to World two. This is the part when the main character takes their trip from their world to the second unfamiliar world. This trip can be very simple or they can run into some challenges when attempting to cross the threshold. The character usually feels confused and doesn't know what to do. This is usually the beginning of the adventures in the story. The hero must cross the threshold between the world he is familiar with and that which he is not. Often this involves facing a "threshold guardian", an entity that works to keep all within the protective confines of the world but must be encountered in order to enter the new zone of experience.  Ex. in Star Wars, when Luke goes to the Dagobah system to find master Yoda.