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We're Getting Mutants in the MCU - The Loop
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Of all the test subjects (aka cats) that Dr. Burr experimented on, Test Subject #11 was the only one that made it to The Above and back in one piece. It marked the success of Project Oystercloud, but things went sour when his daughter touched the test subject. His daughter began to fuse with Test Subject #11, which resulted in the creation of the Cheshire Cat.