When does The Patty Duke Show return?

Patty Duke starred in dual roles of "twin cousins" Patty and Cathy Lane. The series ran from September 18, 1963, to April 27, 1966. A total of 104 episodes, plus an unaired pilot, were produced by United Artists Television. ABC abruptly cancelled the series after three seasons.
Patty Lane (Duke) is a normal, chatty, rambunctious teenager who lives in the Brooklyn Heights section of New York City. Her "identical paternal cousin," Cathy Lane (also played by Duke), is sophisticated, brainy and demure. 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.