Dr. Valentine is a cruel doctor who is revealed to be the head of the NIMH corporation and the secondary antagonist in The Secret of NIMH 2: Timmy to the Rescue. He originally used Martin Brisby for one of his neurological experiments and brainwashed him to insanity. It wasn't until Timmy made it to NIMH that Martin brainwashed him and made Valentine think that he was a dog.

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