A is for Anton Karidian. AKA Kodos the Executioner.
B is for Baroner. A man that Commander Kor found....refreshing.
C is for nurse Christine Chapel. Whose name should not have been mentioned in STID. Not if they were not going to show her.
D is for Dyson Sphere. A Federation vessel actually encountered and crashed into one in the year 2294, but the event wasn't known until seventy-five years later.