Board Thread:Site-Related Tasks (NEW!)/@comment-1713281-20151201050946/@comment-1713281-20151202005158

This is an interesting one. Undoniel brought up The Man (Mutant) (Earth-616). One time appearance in Journey into Mystery, no handbook appearances. But it seems that The Man is one of the earliest instances of "mutants" in Marvel's publications, 7 years before X-Men #1 debuted.