A is for Action. Sweet, loving action from native girls in tinfoil bikinis.
B is for Brawl. Specifically, a brawl with Mr. Finnegan.
C is for computer. Evil computer enslaving a planet that Kirk must double-talk into a programming error or BSD. Thus freeing the puny natives from it's clutches.
D is for Defeating Klingons supplying arms to the natives.
E is for ending a computerized and fully automated war between two planets without any warp capability.
F is for FUBAR. As in how Landru ended up after Kirk took a crack at him.