This is really confusing.  I just finished season 2 and got a bit teary eyed at Susan's departure then put in the next disk about the Amazons or something and ta-da, she's back.  It was really weird for me.  Does anyone know about the order of these or what happened?  Are there more of these incidents?  Are these considered part of the 'normal' series or are they more like the movies?Explaination…