On the cover: Iron Man [ Tony Stark ] ; Vision ; Captain America [ Steve Rogers ] ; Thor [ Donald Blake ] ; Scarlet Witch [ Wanda Maximoff ] ; Quicksilver [ PietroDjango Maximoff ] ; Human Torch [ Johnny Storm ] ; Mr. Fantastic [ Reed Richards ] ; the Thing [ Ben Grimm ]
MARVEL MYSTERY COMICS #8 (June 1940) Art by Bill Everett & Carl Burgos Words by Bill Everett, John Compton & (possibly) Carl Burgos
These three panels represent the first crossover of any Timely Comics character (or any comic book superhero for that matter). It set up the big showdown between the two that was to come and it revealed to readers that the two characters shared the same universe.