 Roy Thomas and George Pérez crafted a metafictional story for "Fantastic Four" #176 (Nov. 1976) in which the Impossible Man visited the offices of Marvel Comics and met numerous comics creators.Marv Wolfman and Keith Pollard crafted a multi-issue storyline involving the son of Doctor Doom which culminated in issue #200 (Nov. 1978).John Byrne joined the title with issue #209 (Aug. 1979), doing pencil breakdowns for Sinnott to finish.