Cathy is a schoolmate of Keith Partridge. She lives at 3rd and Maple, next to the Gibsons. After the Partridges' first record becomes a hit, Cathy develops a crush on Keith, even though they haven't formally met. She follows him to his house, where Shirley Partridge finds her standing in the azalea bed and invites her in. Over the next few days, Cathy continues to come to the Partridges' house after school so she can sit in the living room and watch Keith, who mostly ignores her. She asks Shirley questions about Keith and his preferences. Shirley eventually invites her to dinner, to the dismay of Keith, who has just asked Janet to dinner. Keith drives to Cathy's house to tell her not to come, but a few seconds later he feels guilty and pretends he wanted to tell her something else.