Junior frequency

Unfortunately, something went terribly wrong.
The weather balloon's remote control was jammed by a bizarre, high-frequency signal from somewhere in the island interior, and the balloon detonated too early, and while it spread the nutrient-enriching compound over the island, it also spread the radioactive catalyst which created an "atomic storm" that ravaged the island and nearly wiped out the base.
After the storm, the team decided to survey the island and note the vast increase in size of the local flora and fauna (including a species of giant mantis). Eventually, it was discovered that the high-frequency noice emitted from a large egg in the center of the island, and the egg was under attack by the "Gimantis," and their matriarch, KAMACURAS. Thankfully for the quickly hatching newborn, GODZILLA appeared from the sea, responding to the infant's call for aid.

Godzilla Jr Bio