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And now... my Mecha. It's not only Godzilla's equal... but his superior. The Apex Titan of my own hand. It's time to show the world what you can do.
~ Walter Simmons upon witnessing the full activation of Mechagodzilla.
Walter Simmons is the central antagonist of the 2021 crossover film Godzilla vs. Kong.
At first, Walter seems like a well-spoken and calm man who seeks to better mankind and help the world became a safer place. But his view of the Titans being seen as a threat somewhat puts him at odds with Monarch. Walter became very corrupt and recklessly determined in his goals and attempts to rid the world of Titans by all means, no matter the cost.
Simmons founded Apex Cybernetics in 2014. His goal was to rid the world of the Titans so control could be returned to humanity. In 2019, Simmons purchased the severed head of King Ghidorah from Alan Jonah so he could construct his own Titan to combat the Titans, thus beginning the development of Mechagodzilla.
Godzilla vs. Kong
Five years later, in 2024, all Titans excluding Godzilla and Kong have went back to hibernate all cross the world. Godzilla then attacks an Apex facility manufacturing Skullcrawler eggs that are transported to the Apex headquarters in Hong Kong. During a test battle against a Skullcrawler and Mechagodzilla, the test is cut short due to limitations of the power supply. After learning of the Hollow Earth, Simmons intends to harness the raw energy of Hollow Earth to overcome Mechagodzilla's limitations.
Simmons recruits Nathan Lind to explore into the Hollow Earth and obtain a sample of the energy, using his daughter Maia as the leader of the Apex expedition. They soon find an energy source and send its signature back to the base. Apex also catches Bernie, Josh, and Madison and have them interrogated by Simmons. Madison calls out Simmons for using Ghidorah to create Mechagodzilla as the reason Godzilla rampaged, claiming hundreds to thousands of lives. Showing no remorse for his actions and justifying every sacrifice to be necessary to ensure humanity's survival. Eventually, Simmons desperately orders the activation of Mechagodzilla, despite not testing the energy source first. This causes Mechagodzilla to go haywire, as the energy source causes Ghidorah's consciousness to possess Mechagodzilla. Simmons could only look on in horror before Mechagodzilla swiped its claw straight through the Apex module, killing him instantly.
I love crazy ideas. They made me rich.
~ Simmons to Nathan Lind
There can only be one alpha. It seems to have been providence.
~ Simmons to Madison Russell
You see, ten years ago, when Gojira was first revealed to the world, I had a dream. And in that dream, I saw one thing. And that beautiful amazing thing was- Oh sh*t. NO!
~ Simmons' last words before he is killed by Mechagodzilla.
Walter Simmons appears to be the embodiment of how Ishirō Serizawa perceives humanity's arrogance, in which he seeks to place humanity as the dominant species in the world and maintain the position by eliminating the Titans via through Mechagodzilla.