Ancient Godzilla had swam down rather than follow the main party to Monster Island, as it still had some wounds that needed to be healed and it lacked the time to just sit and wait for it to fully heal over. If it was to recover to full strength from its gauntlet of battles, it'd need to supercharge the process and the Titan seemed to have an idea of sorts.
It had gotten a fair map of the oceans of the world, being constantly on patrol for threats that disrupted the natural balance to the world, and to its memory there was an old sunken Russian nuclear sub. Most of the energy had faded but there was still some that remained in its haul, enough that Godzilla intended to use to heal up its stomach wound and recover its lost energy. Sure enough, the wrecked vessel was in view along the bottom of the ocean bed and the Titan worked to pry it open as it began to feed on the leftover radiation, already feeling quite rejuvenated as its dorsal plates seemed to shimmer blue.
Once it finished up its meal, it swam onto the surface and began to move in the direction of its main course...Monster Island.
Gigan managed to avoid detection and circled back to an underground base which connected to the hidden laid under World Children's Land, and while more invaders seemed to arrive on Earth there seemed to be a gathering at Monster Island. The spy monitors of the M Space Hunter Nebula squadron looked onto the action in kind as their leader seemed to mill over what to do.
"Should we deploy Gigan? Many of Earth's monsters seem to be gathering there, we could use this chance to cut them down and make conquest easier." One of the M Space Hunter Nebula operatives, dawning a human woman disguise, asked from her monitor as the leader seemed to rub his chin in thought.
"No. We cannot match up with an armada of this seize. When we defected we became isolated and if we remove enemies to that empire, we will be destroyed." The leader countered, seemed it was best that they stay out of this conflict...but then an idea came to his mind.
Perhaps....it would be best to actually lend a hand to these Earth warriors. An enemy of my enemy situation...
Soon enough George seemed to regain consciousness, as he had been on some sedatives needed as his arm healed over. And once it had George seemed to notice the troubled expression Frankenstein seemed to have, which confused the albino ape but soon its own senses seemed to pick up on the trouble it could not see but that unshakable tension had hung thick.
"Seems something is bugging them." Davis muttered.
"That something is Monster Island. Seemed many of the invading monsters and Earth monsters are gathering there. A sizeable clash is uppn us." Madison explained using Monarch satellite images to get a feel of the situation. George understood now that they needed to fight, and looked at Frankenstein with a nod as Davis seemed to catch on.
"Just be careful. Both of you." Davis said, and while Madison had not been sure if it was for the best, the supersized hanger opened up all the same as she decided to let the "brothers" sort out what they desired to do.
The battle seemed to not be going well, specifically for King Godzilla. The father tried to combat many of the stronger invaders alone, and those invaders showed a lack of mercy as tension already seemed to be high. However, the water along the shore of monster island began to shine blue as something seemed to be bubbling below the surface.
And then, a powerful stream of atomic energy burst from the water and blasted at a few of the invading monsters that King Godzilla seemed ot battle with. And out of the water the Titan himself surfaced as Ancient Godzilla rose tall and let out a mighty roar at the creatures who dared come here to try to bring ruin to its home.