Trials and Tribble-ations, DS9 5
The greatest fan-wank of all, putting Sulu in Voyager to shame. It was Dax who bopped that last Tribble off Kirk’s head! (And she did it in a red miniskirt!!)
The DS9 gang runs amok in one of TOS’s greatest scenarios, which in-jokes flying in every which direction. Also: the first canonical reference to the Ridged/Smooth Forehead conundrum. Huzzah!