https://gizmodo.com/disneys-rats-of-nihm-was-inspired-by-hideous-lab-experi-1642283287
It's hard to explain if you haven't seen it. There is some aspect of the rats being….enhanced, but the overall film was highly critical of government. It was merely shopped to Disney, full concept.
His former colleagues said he is a pretty uninteresting, mediocre intelligence, incompetent scientist.