This is a rare and valuable comic book featuring two of Marvel's iconic superheroes, Iron Man and Sub-Mariner. The first issue was published in April 1968 and the cover was illustrated by legendary artists Bill Everett and Gene Colan. The comic book is in the US Comics tradition, written by top writers and artists including Johnny Craig, Roy Thomas, Gene Colan, Frank Giacoia, and Archie Goodwin. The storyline involves Namor McKenzie, Leonard McKenzie, Whiplash, A.I.M., Big M (Whitney Frost), Destiny, Jasper Sitwell, and Iron Man (Tony Stark). The language used in this comic book is English and it is from the Silver Age era. It is a must-have collectible for all fans of superheroes and comics.