"Where No Man Has Gone Before" has always been one of my favorite episodes, mostly for the "what might have been" aspect of the different cast members. Many of the books seem to reference that Kirk had always wanted Mitchell as is XO, but for various reasons, Starfleet nixed it. Other books suggest that Mitchell was XO, and Spock took over as such after his demise. What is the history of that thinking? Where it come from? As many times as I've seen the episode, I can't think of anything that leads me to that conclusion, beyond Mitchell announcing that the department heads were on the bridge as Kirk requested. Even to say he would be Second Officer is flimsy at best. I'm just wondering what our resident trek historians think about it.