"To ... go where no man has gone before" (mission of Star Trek's Enterprise) (6)
I believe the answer is:
boldly
(Other definitions for boldly that I've seen before include "` `To ...... go where no man has gone before' '(Startrek)" , "Confidently and courageously" , "''To ... go where no man has gone before'' (Star Trek mission)" , "Confidently, with daring" , "Confidently, daringly" .)