A is for Ambassador-class starships. The fourth Federation starship named Enterprise was a member of this class. B is for Barclay's Protomorphosis Syndrome. C is for the Ceti Alpha star system, where the former Earth tyrant Khan Noonien Singh was exiled in 2267 along with his surviving Augment followers. D is for Dabo girls and Deela, whose fancy for Kirk allows him to scotch the Scalosians' cold plans for Enterprise and her crew. E is for Excelsior. She's supposed to have trans-warp drive.