A is for Apollo. He spent centuries on Pollux IV waiting for Earth humans to develop the technology with which to travel to the stars.
B is for Balok. Commander of the Flagship Fesarius of the First Federation.
C is for Capellans, masters of the kligat and furry hats.
D is for "Double Dumb Ass on you!"
E is for Enterprise CVN-65, secretly boarded by Chekov and Uhura so they could collect photons from the vessel's nuclear reactor.