On one hand - a pilot for some other show that is nothing like Star Trek and the TOS cast basically has nothing to do with anything that goes on besides just kind of hanging around.

On the other - weird bodyswap nonsense with Shatner chewing the scenery even by his standards and them blanket saying women can't be captains then seemingly going out of the way to show why that is by depicting the woman as completely incompetent and insane.

And despite airing order, going by the Stardate alone, the answer is "All Our Yesterdays".