Plot
Patty Lane (Duke) is a normal teenager living in the Brooklyn Heights section of New York City (and as the lyrics to the theme song point out--"Patty loves to rock 'n' roll, the Hot Dog makes her lose control!"). Her father is the managing editor of the New York Daily Chronicle. In the unaired pilot episode, her "identical cousin" Cathy Lane (also played by Duke), whose father also works for the Chronicle as a foreign correspondent, arrives in the United States from Scotland to live with Patty's family and attend school.
The show's premise is that Cathy is more worldly and demure than identical looking cousin Patty. The remarkable physical resemblance that Patty and Cathy Lane share is explained by the fact that their fathers are identical twins.
Duke played a third lookalike role in the second season episode "The Perfect Hostess", in which Patty and Cathy come face to face with their southern belle doppelganger when distant cousin Betsy visits from Chattanooga, Tenn.
Read more about this topic: The Patty Duke Show
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“The plot was most interesting. It belonged to no particular age, people, or country, and was perhaps the more delightful on that account, as nobody’s previous information could afford the remotest glimmering of what would ever come of it.”
—Charles Dickens (1812–1870)