When did Marvel and DC first appear in their respective universes? 1 / 8
The Marvel Comics offices often show up in the New York-based Marvel Comics. 2 / 8
Like when the Impossible Man and the Fantastic Four fought in the Marvel offices. 3 / 8
Or like when John Byrne attended the Trial of Galactus because he handled the FF comic. 4 / 8
Over at DC Comics, there was Earth-Prime, where the 'real' artists and writers lived. 5 / 8
Flash #123 saw Gardner Fox become part of the DC Universe for the first time. 6 / 8
At Marvel, Johnny Storm reads a Hulk comic in Fantastic Four #5. 7 / 8
The clincher was in Fantastic Four #10, when Doom visited Stan Lee and Jack Kirby! 8 / 8