List of The Patty Duke Show episodes
"The Patty Duke Show" is an American television sitcom starring Patty Duke, William Schallert, Jean Byron, Paul O'Keefe and Eddie Applegate that originally ran on the American Broadcasting Company (ABC) from September 18, 1963 to April 27, 1966.
Double Trouble (U.S. TV series)
Double Trouble is an American sitcom that aired on NBC from April 4, 1984 to March 30, 1985.
 The series stars identical twins Jean and Liz Sagal as Kate and Allison Foster, two teenagers living under the watchful eye of their widowed father.
 The show was considered an updating of the "twins in mischief" concept seen in films like "The Parent Trap" or the "Patty Duke Show" of the 1960s.
 The Sagal sisters acknowledged that Norman Lear, the Sagal family's godfather, was the one who held influence over the show's concept.
The Patty Duke Show
The Patty Duke Show is an American sitcom that ran on ABC from September 18, 1963 to April 27, 1966, with reruns airing through August 31.
 The show was created as a vehicle for rising star Patty Duke.
 105 episodes were produced, 104 of them airing over three seasons, most written by either Sidney Sheldon or William Asher, who co-created the series.
Patty Duke
Anna Marie "Patty" Duke (December 14, 1946March 29, 2016) was an American actress, appearing on stage, film, and television.
 She first became known as a teen star, winning an Academy Award for Best Supporting Actress at age 16 for her role as Helen Keller in "The Miracle Worker" (1962), a role which she had originated on Broadway.
 The following year she was given her own show, "The Patty Duke Show," in which she portrayed "identical cousins".
 She later progressed to more mature roles such as that of Neely O'Hara in the film "Valley of the Dolls" (1967).
 Over the course of her career, she received ten Emmy Award nominations and three Emmy Awards, and two Golden Globe Awards. Duke also served as president of the Screen Actors Guild from 1985 to 1988.
Eddie Applegate
Edward Robert "Eddie" Applegate (October 4, 1935 – October 17, 2016) was an American television actor, best known for his work in the 1960s, most notably in the role of Richard Harrison, the boyfriend of Patty Lane on "The Patty Duke Show".
United Artists Television
United Artists Television (UATV) was an American television production/distribution studio of United Artists Corporation that was formed on New Year's Day (January 1), 1958.
 The company is remembered for producing series such as "This Man Dawson", "World of Giants", "Stoney Burke", "The Outer Limits", "Gilligan's Island", "My Mother the Car", "The Fugitive", "The Rat Patrol", "thirtysomething", "The New Phil Silvers Show", "The Patty Duke Show" and "The Pink Panther Show".
 In September 2014, the studio briefly returned to full-time TV production under the new management of United Artists Media Group (UAMG), led in part by husband and wife producers Mark Burnett and Roma Downey.
 With its folding back into MGM Television, UATV is dormant once again.
Paul O'Keefe
Paul O'Keefe (born April 27, 1951) is an American actor best known for his work as Ross Lane, the younger brother of Patty Duke's character Patty Lane in the television series "The Patty Duke Show" and for the movie "The Daydreamer".
 Born in Boston, MA, he began his schooling at the Immaculate Conception School and at the New England Conservatory of Music.
 He appeared on television with such actors as Sid Caesar, Sarah Vaughan, and Bob Hope.
 At the age of 7 years, he played Winthrop Paroo in the 1959 play "The Music Man".
 Prior to his engagement for "The Music Man", he played Little Jake to Dolores Gray's "Annie Get Your Gun" at the Carousel Theatre in Framingham, Massachusetts.
Joseph Hoffman
Joseph Hoffman (1909–1997) was an American screenwriter.
 Mr. Hoffman was born February 20, 1909 in New York City.
 He began a distinguished career as a screenwriter when he came to the West Coast in the mid-‘30s and was installed as a junior screenwriter at 20th Century-Fox.
 He is credited with writing the story, dialogue or screenplay for 57 movies from the adaptation of "Your Uncle Dudley" in 1936 to screenwriter of "The King's Pirate" in 1967.
 Any listing of his screen credits illustrates the diversity of his writing talent including “swashbucklers”, comedies, mysteries and westerns.
 From the mid-'50's into the '60's, Mr. Hoffman wrote for episodic television including - "Leave it to Beaver", "My Three Sons", "The Smother's Brothers Show", "Bonanza", "The Virginian", "Family Affair", The Patty Duke Show" and many more.
 From 1954 on, he also worked as a Television Producer at Screen Gems on - "Colt 45", "Ford Television Theatre", "Michael Shayne, "Private Detective" and the "Audie Murphy" Series.
 He died in Los Angeles on May 25, 1997 at age 88.

Question: A half-hour series that starred an actress who played Natalie Lane in The Patty Duke Show, also starred what other actress?
Answer: Dyan Cannon