I'm confused, if the first official pilot was "Where no man has gone before" which is episode 1x03, what about 1x01 (The man trap) and 1x02 (Charlie-X)?? These have Shatner in them, so he was introduced BEFORE the pilot?
These are the numbers following air-date order, not production order. "Where No Man Has Gone Before" was the 2nd produced (counting "The Cage" as the first), "The Man Trap" was the 6th, "Charlie X" was the 8th. The network or the studio often shuffles episodes around to give a balance to the variety of stories on a particular series (at least that's the theory; sometimes it just leads to viewer confusion as in the Firefly example above).