A is for USS Adelphi, involved in the notorious Ghorusda disaster sometime prior to 2366.
B is for Boy Genius: Wesley Crusher.
C is for Crystalline Entity.
D is for Data, our beloved android.
E is for Elementary, My Dear Data.
F is for Farpoint Station.
G is for Gregory Quinn, high-ranking admiral at Starfleet Command
H is for Haliian, an oft-forgot species from the latter seasons.