The Patty Duke Show is an American television sitcom created by Sidney Sheldon and William Asher. The series ran on ABC from September 18, 1963, to April 27, 1966. The series was developed as a vehicle for teenage star Patty Duke, who had won an Academy Award the previous year. Duke starred in dual roles of "twin cousins" Patty and Cathy Lane. The series co-starred William Schallert, Jean Byron, Paul O'Keefe, and Eddie Applegate. A total of 104 black-and-white episodes, plus an unaired pilot, were produced by United Artists Television. ABC abruptly cancelled the series after three seasons. Premise Patty Lane (Duke) is a normal, chatty, rambunctious teenager who (according to the theme song lyrics) lives in the Brooklyn Heights section of New York City (although the setting and characters resemble the more simple and wholesome Middle America). Her father, Martin Lane (William Schallert), is the managing editor of the New York Daily Chronicle; Patty affectionately addresses him as "Poppo." Her "identical paternal cousin," Cathy Lane (also played by Duke), is sophisticated, brainy and demure; her father Kenneth (also played by Schallert) is Martin's identical twin brother. Since the widowed Kenneth is often away for as a foreign correspondent for the Chronicle, Cathy moves to the United States to live with Patty's family – which also includes her mother Natalie (Jean Byron) and brother Ross (Paul O'Keefe) – and to attend Brooklyn Heights High School with Patty and her boyfriend Richard (Eddie Applegate). While the girls are physically identical, their style, tastes and attitudes are nearly opposite, which is responsible for some of the comedic situations on the show. Though the character of "Cathy" received first billing over the character of "Patty" in the show's opening credits, virtually all episodes centered around Patty's misadventures, with Cathy often only playing a minor supporting role. The remarkable physical resemblance that Patty and Cathy share is explained by the fact that their fathers are identical twins. While Patty speaks with a typical American accent, Cathy speaks with a general European accent; not surprisingly, however, both cousins are able to mimic each other's voice. Patty and Cathy have an additional identical cousin, Southern belle Betsy (also played by Duke), featured in the season two episode "The Perfect Hostess." Episodes Cast Patty Duke as Patty Lane and Cathy Lane Duke also "guest-starred" as Betsy Lane in the episode "The Perfect Hostess" (1965) William Schallert as