A is for 'Au Revoir.' What Cyrano Jones, then Kirk said in passing during the incident where there were "Trouble with Tribbles."
B is for the Bubble-headed mind-frackers of Talos IV.
C is for the Cardassians, one of the great Alpha Quadrant powers for much of the 24th century.
D is for Denobula Triaxa.
E is for the Enterprise-C, the fourth Federation starship to bear the name and the last Enterprise for almost twenty years following her heroic destruction at Narendra III in 2344.
F is for Ferenginar. It's national anthem is probably "Rain, Rain. Go away....Come again some other day".
G is for the Gorlan Uprising in the Mirror Universe, brutally crushed by ISS Enterprise captain James Kirk at some point prior to 2267.
H is for Hypospray. Not so futuristic anymore.