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| “ | Too much growth weakens an organization, what should be important becomes overshadowed by greed! Mass production?!? Ridiculous!!! One masterpiece is enough! | „ |
| ~ Greg in the opening cutscene of Decisions, Decisions. |
Dr. Greg Mueller is the overarching antagonist of 2003 survival horror video game Resident Evil Outbreak. He is a researcher for the Umbrella Corporation. Initially, he seems to go against the company for their morals and ethics, but their greed for wanting to create more clones of Thanatos, while he wants it that stands above all else as the pinnacle of creation.
Biography[]
Dr. Mueller was a researcher affiliated with Umbrella Corporation’s Development Center in Raccoon City. By 1993, he was already contributing to the t-Virus Project, serving as the financier for an illegal human experimentation program at a hospital in the Arklay Mountains, where patients were deliberately infected with a t-Virus strain engineered for its potential anti-carcinogenic effects. Beyond his work at various Umbrella facilities, Mueller also held a position at Raccoon University. In 1996, he subjected his colleague, Yoko Suzuki, to t-Virus experiments and later performed a procedure on her designed to alter her memory, an effect that was not undone until October 1998.
Raccoon University, built above a network of disused facilities, was rebuilt into a key site for bioweapons research and storage. Within its hidden laboratories, development began on the “Thanatos” project, an experimental successor to the mass-produced T-103 series. By August 1998, Dr. Mueller opposed Umbrella’s plans to clone Thanatos for large-scale production and quietly started working against the corporation. Working alongside Dr. Peter Jenkins, a professor at Raccoon University, Mueller helped develop a vaccine capable of countering even Umbrella’s enhanced ε strain, which they named “Daylight.” To hide his true motives, Mueller claimed to Jenkins that he was a former Umbrella Chief Researcher (likely tied to the Tyrant Project) and that a colleague still inside the company had smuggled him a t-Virus sample. However, Mueller had no intention of using it to combat the steadily growing outbreak in Raccoon City. Instead, he sought to use it as leverage, threatening to expose and sabotage the t-Virus Project unless Umbrella agreed to leave both him and the Thanatos experiment untouched.
When the modified ε strain contaminated Raccoon City’s water supply, tens of thousands of residents transformed into zombies within hours. Mueller and Jenkins stayed behind at the university as their fellow researchers fell victim to the infection. Eventually, Mueller killed Jenkins to eliminate any loose ends. Knowing Umbrella would exploit the chaos and dispatch an armed unit to silence him, Mueller responded by unleashing Thanatos, programming the creature with explicit orders. Thanatos answered Mueller’s command with brutal efficiency, annihilating the UBCS Charlie Team and leaving only Sgt. Nikolai Zinoviev alive. By dawn, Mueller learned that a group of survivors, tipped off by Jenkins’ secret betrayal, had managed to produce several samples of the Daylight vaccine. Confronting them, Mueller threatened to unleash Thanatos upon the group, but before he could act, Sgt. Zinoviev shot him in the head. Moments later, Nikolai armed a cache of C4 charges, setting the university on a path to destruction.
Trivia[]
- It is unknown who voices him.
External Links[]
- Thanatos on the Resident Evil Wiki

