It's a monster-size megabattle of butt-kicking, rampaging, thermonuclear proportions! The size-changing superhero Hero Zero heads down to San Diego in his alter ego as young David MacRae. He's looking for monster deals at the biggest comic-book event of the year, the San Diego Comic Convention, but what he winds up with is a monster of a different color, that atomic fire-breathing lizard lovingly referred to as Godzilla! Hero Zero learns a hard lesson, San Diego takes a pounding, and Godzilla shows why he's King of the Monsters.