A is for Annorax and his mighty temporal weapon.
B is for the Borg Collective, which originates from and has its base within the Delta Quadrant.
C is for Chaotic Space. Voyager encountered a patch of it there.
D is for... something other than Delta Quadrant.
E is for Enara Prime, a planet encountered by Voyager.
F is for False Profits.
G is for the Gift of 9500 light years, given to Voyager by Kes.