It only made sense to bring in another character. Although they already had Yvonne Craig as Batgirl, somehow, he thought of adding the character of Wonder Woman to the mix.
Would the entire Justice League had followed?
Unfortunately (or, maybe fortunately), the pilot he did for Wonder Woman did not catch the zeitgeist.
Wonder why (pun intended)?
Check out the sizzle reel for the 1967 Wonder Woman (in which Diana Prince and Wonder Woman are two separate actresses):
Told ya so…
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