In Mexico, the mystery couple reminisce about the first time they met, and it is revealed that they are in reality Martin and Katherine, the missing and presumed dead Harmonyites. Gwen and Ethan demand that Theresa take a pregnancy test, since they have proof that the eggs were not viable and could not be carried. After Luis tries to kill him, Dr. Ackland comes clean with him about everything that Alistair forced him to do. As Antonio leaves to get Pilar so Sheridan can say goodbye, Luis shows up at the door. (thetvdb.com)