A is for the Archons, their return is the basis of an episode of TOS.
B is for the Bolians.
C is for the Cairn. Their telepathy is different from the Betazoids'.
D is for Data, he could have lived forever, but didn't.
E is for Estragon, the name given to one of four fish in a koi pond by Ensign Zak Kebron as he waited for Erril G'Doh.
F is for French, a dead language according to Data.
G is for Garak, he is now Castellan.
H is for Hagath, a pretty scary arms dealer.
I is for Iggy Pop. He played Yelgrun.
J is for Jim as in "He's dead, Jim!".
K is for the IKS Klothos, one of the first Klingon ships to be equipped with a cloaking device, according to Kor.
L is for the Letheans, they read your mind or scramble it on occasions.
M is for Morn's tantrum. He panicked and even hurt Quark.
N is for the Nerada, a Nasari starship that shouldn't be confused with the Narada, a totally different ship.
O is for Organians, as high above us on the evolutionary scale as we are above the amoeba.
P is for Pistols, they still use them in Holodeck Western simulations.
Q is for Queen Arachnia, leader of the Spider People. Beware her uncorked pheromones!
R is for Rigellian fever, it's bad!!!
S is for Stinky, or Malcolm Reed as he's better known
T is for Martok's Targ, it stinks.
U is for the USS Hiawatha (NCC-815), a medical frigate that crashed on an asteroid during the Klingon War in 2256.
V is for Vasily Zeitzev, an operative in Section 31.
W is for the Wagon that Scotty's grandma would be if she had wheels.
X is for Xavier, Professor Xavier, who runs a school for gifted freakazoids, and looks remarkably like Picard
Y is for Yellow, the color of command in TOS, security in later series.
