When we last left our hero, Godzilla had recruited Mothra and Rodan to attack the headquarters of the evil corporation, Genco, in order to steal back his egg.
So what does Genco do, you ask? Well, apparently they build Mechagodzillas and Mecha-King Ghidorahs...though not very well!
Somehow (on the last page), Godzilla rips the top off of the Genco building in exactly the right place to scoop up his egg, and then blasts Lex Luthor with a huge beam of atomic breath, which should teach him a lesson. It reminds me of a similar scene in GODZILLA 2000, except there's no egg involved of course!