What was Agent 99’s (Barbara Feldon’s) name on the TV series “Get Smart” (NBC, CBS, 1965-70)?

Agent 99’s (Barbara Feldon’s) name on the TV series “Get Smart” was never revealed, although on one episode she had the cover name of Susan Hilton.

Who produced the CBS “rural sitcoms” of the 1960s “The Beverly Hillbillies” (1962-71), “Petticoat Junction” (1963-70), and “Green Acres” (1965-71)?
Who played Hymie the Robot on the TV series “Get Smart” (NBC, CBS, 1965-70)?
Which New York criminal mastermind was nicknamed Mr. Big?
Who played the Chief in The Nude Bomb (1980), the movie based on “Get Smart” (NBC, 1965-70)?
What were the first names of the shipwrecked Robinsons in the TV series “Lost in Space” (CBS, 1965-68)?
Who were Arnold Ziffel’s parents on the TV series “Green Acres” (CBS, 1965-71)?

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