Crossword Clue:

the sixth member of a series

AnswerCrossword Clue
MARINERMember of the only M.L.B. team never to have played in a World Series
AGENAMember of the Gemini series
EFGFifth, sixth, and seventh of a series
DOUGSixth-grader of a 1990s cartoon series
ZETASixth in a series
ADAMSSecond or sixth in a series