Premise: Broadside is an American sitcom that aired on ABC during the 1964-1965 TV season. The series, produced by "McHale's Navy" creator Edward Montagne, starred Kathleen Nolan, formerly of "The Real McCoys" (her character, Lieutenant Morgan, had first appeared on "McHale's Navy" the previous season).
Hypothesis: The sitcom Broadside is a spinoff of the popular show McHale's Navy.