Left Behind is the seventh episode of Season One. It attracted 1.66 million viewers on its original airing. MARY AND CATHERINE UNITE TO SAVE A CASTLE UNDER SIEGE — Mary and Catherine are forced to rely on one another when the castle is taken hostage, and Catherine shocks everyone when she makes a surprising proposal to try to save their lives. Meanwhile, Bash's mother Diane tells Bash of her plan to have him legitimized. Henry, Kenna, Aylee, Lola and Greer also appear. For the first time…