Lucie Arnaz, Ball’s daughter, appeared in several episodes of the show during its run: she was an extra in the first season’s third episode, "Lucy Is a Referee," the teenage best friend of Chris in "Lucy Is a Soda Jerk" and "Lucy Is a Chaperone" (though she was only 11 at the time), and later as one of her mother’s friends in the 1967 "Lucy and Robert Goulet" (although she was only 16). She was also seen briefly as a teen walking past Lucy and Mr. Mooney in the episode "Lucy and the Ring a Ding Ring". She was also seen playing a student named Patty in the episode "Lucy Gets Her Diploma".