Majel Barrett Roddenberry was first officer of the Enterprise in the first pilot episode of Star Trek "The Cage" and would go on to play nurse Chapel in later episodes of TOS.
Now my questions. If M.B.R. hadn't been cast as Chapel and TOS had run longer then 3 years do you think M.B.R.'s number one could've been transferred off the Enterprise and promoted to Captain of a starship? Would she have been a good Captain?
I'd have liked to have seen her as Captain of a starship on TOS!