Ms. Betty Ardath moves next door to Doc's workshop, opening up The Captain's Inn bed-and-breakfast, on Fraggle Rock. She was first mentioned in the second season episode "A Cave of One's Own," in which Doc is initially resistant to her presence. He is soon won over by her charm and works part-time at the Inn, performing many odd jobs. Occasionally, Sprocket teasingly implies that Doc has a crush on Ms. Ardath, and Doc's own behavior does not contradict such a conclusion. Ms. Ardath owns an airedale named Marigold, who Sprocket himself is in love with.
Ms. Ardath is implied to be attractive and comparatively young in contrast to Doc (in "The Perfect Blue Rollie," she celebrates her 39th birthday), but like the inn itself, or fellow neighbor Ned Shimmelfinney, Ms. Ardath is never seen onscreen.