In the dimly lit laboratory, the tension was palpable as Megatron, Shockwave, Starscream, Soundwave, Knock Out, and the other Decepticons gathered around the massive containment tube. The air buzzed with the hum of advanced machinery, and Shockwave's optic glowed with a mix of satisfaction and anticipation.

"Prepare yourselves," Shockwave intoned, his voice cold and precise. "The final phase is upon us."

With a swift series of keystrokes, Shockwave activated the final command on the console. The immense energy influx, previously spiking erratically, was now being channeled directly into the massive creature within the tube. Godzillagon, the ancient Kaijupticon, began to absorb the energy, its form solidifying and growing more defined with each passing second.

Unbeknownst to the Decepticons, the Autobots had already infiltrated the base. Optimus Prime, Ratchet, Arcee, Cliffjumper, Bulkhead, Bumblebee, and Elita-One silently observed from the shadows, their optics wide with shock and dread as they witnessed the colossal creature come to life.

The laboratory was filled with an eerie silence as the Autobots held their breath, watching the unfolding scene. Then, a low rumble began to emanate from within the tube, growing in intensity until it became a deafening roar. Godzillagon's eyes snapped open, glowing with an ancient, malevolent light. Its head turned slowly, taking in its surroundings with a predatory gaze.

Megatron's smile widened, his optics gleaming with triumph. "Behold, Decepticons! The king of the Kaijupticons, Godzillagon, has awakened. With its power, we shall crush the Autobots and reclaim Cybertron!"

Godzillagon's massive claws flexed, each digit ending in a razor-sharp talon. It raised one colossal arm, examining its own strength before clenching its hand into a fist and releasing it. The ground trembled beneath its movements, and the Autobots could feel the immense power radiating from the creature.

Optimus Prime motioned for his team to remain hidden, his voice a barely audible whisper. "Stay alert, Autobots. We need to find a way to stop this before it escalates."

But before the Autobots could formulate a plan, Godzillagon threw its head back and released a thunderous roar that shook the entire laboratory. The sound reverberated through the walls, causing equipment to rattle and debris to fall from the ceiling.

Starscream took a cautious step back, his usual bravado momentarily faltering. "Megatron, are you certain we can control this beast?"

Megatron's confidence was unshaken. "With Godzillagon at our command, the Autobots will be nothing more than a memory. Shockwave, ensure the creature's loyalty to the Decepticon cause."

Shockwave nodded, his optic focusing on the interface that linked directly to Godzillagon's neural network. "Initiating loyalty protocols now, Lord Megatron."

As Shockwave worked, the Autobots knew they had to act quickly. Optimus Prime signaled to his team, and they began to move stealthily towards the control interface, hoping to disrupt Shockwave's programming before it was too late.

But in that moment, Godzillagon's primal instincts took over. The ancient beast's eyes locked onto the hidden Autobots, sensing their presence. With a ground-shaking step, it turned its massive body towards them, its maw opening wide to release another bone-chilling roar.

The Autobots were exposed, and Megatron's eyes narrowed with malice. "Well, well, Autobots. It appears you've decided to join the party. How thoughtful."

Optimus Prime stepped forward, his voice resolute. "Megatron, you must stop this madness. Godzillagon's power is beyond your control. You're endangering all of Cybertron."

Megatron laughed, the sound devoid of any warmth. "On the contrary, Prime. With Godzillagon, we secure our victory."

The battle lines were drawn, and the stakes had never been higher. As the Autobots prepared to face the monstrous Godzillagon and the assembled Decepticons, they knew this confrontation would determine the fate of their world.