Fred gets a physics article published and is asked to speak on it.  When she is attacked on stage by something out of a portal, she gets suspicious of her old professor.  Discovering that he's the one that sent to to Pylea originally, she vows revenge.  When Gunn and Angel refuse to help her kill him, she enlists Wesley's aid.  Angel and Gunn show up but are they in time to keep Fred from killing her old mentor?