I seem to recall BaBara Luna claiming her "Buck Rogers" episode pretty much recycled the plot from an episode of some old Western she'd previously guest-starred on. (Bonanza?) Luna played essentially the same part in both versions, which were also written and/or directed by the same guy. According to her, they had joked at the time about the fact they were doing the same story--but this time in space!
Forgive my fuzzy memory, but this was something she mentioned in person at a Star Trek event many, many years ago.