The production story behind Genesis II carries a petty, gleeful footnote in the long war between creators and network censorship. During the original Star Trek years Gene Roddenberry had been repeatedly forced into reshoots and awkward costume trims because NBC's Broadcast Standards — derisively nicknamed by Roddenberry the "BS Department" — objected to the showing of navels and other minor intimacies. The grudge survived. When Roddenberry wrote Genesis II in the summer of 1972 (a six‑week sprint while on vacation in the Bahamas) he quietly encoded his frustration into the DNA of his villains: the Tyranians. Their distinguishing physical trait was a double navel, a flourish that let him legally and gleefully film as many exposed midriffs as he liked — and then point out that he was effectively showing every navel the censors had once tried to erase, twice. It is a small, vindictive example of how television creators pushed back against network moral policing by embedding jokes and jabs into scripts and costuming choices.
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