One of the last extra storylines in Foster's LOG TEN involves the Flintstones/Gilligan's Island conceit of switched bodies. Kirk, Uhura, Spock and Sulu are all accidentally sent into each other. Sulu is in Spock's body, Spock in Uhura's (fascinating), Uhura in Kirk's (revolting for her) and Kirk in Sulu (not touching that, too easy). Before they were restored to normal, Uhura-as-Kirk bested a Klingon in combat.
I had forgotten all about that, but now it's registering a dull thud in my memory. Fascinating indeed.