A is for Altair glow water.
B is for Brandy. I said, Give Me The BRANDY!!
C is for Centauran slugs.
D is for Dominic Keating.
E is for Earth: the homeworld of two different spacefaring civilizations separated by tens of millions of years.
F is for Ferengi, Roddenberry's next great villian.
G is for Gorn eyes. In our universe they appeared to be compound in nature and were silver in color. In the Mirror Universe they were more traditionally reptillian in design and appearance.
H is for Helen Noel. Proof that there's Christmas in Star Trek.
I is for Impudence. Both Trelane and Q thought that humans displayed it.
J is for Jonathan "I bet you really want to beat me up now don't you!" Archer.
K is for the Klingon invasion of Cardassian space at the beginning of 2372.
L is for Ligonian Deathmatch to the Death.
M is for Martia's shapeshifting. She could even turn into Jim Kirk if she wanted.