Martin Brisby

Martin Brisby is the main villain in the movie The Secret of NIMH 2: Timmy to the Rescue. He did appear in the first "Secret of NIMH" film, but he wasn't villainous then, so that doesn't count. Instead, this is about when he was a villain in the sequel.

Martin is Timmy's brother and son of Mrs. Brisby. He was captured by NIMH (Secret of NIMH). He became insane when the doctors brainwashed him. After being made insane, Martin took over the lab and brainwashed Dr. Valentine with a device similar to the one Valentine used on him and made him think he was a dog. Martin plans to use an army of lab rats riding a flock of ravens to take over Thorn Valley.

He asks Timmy to join him, but he refuses and is locked in a cage as Martin drags Jenny away to try to make her his queen. Timmy escapes with the help of Cecil and they go to free Jenny. Together, they knock out Martin and Timmy tricks Martin's army of ravens and rats to fly in the wrong direction. Timmy and Jenny then leave to find the others, only to find once everyone is free that NIMH is on fire. The survivors (Timmy, Jenny, and her parents) flee. Timmy goes back to save Martin. Before he leaves, Jenny tells him she loves him and he tells her the same. After being attacked by the crazy cats once again, Timmy sends them down an elevator shaft and finally finds Martin... actually, Martin finds him.

Timmy and Martin are able to escape through the lab's skylight, with some help from Jeremy. Jeremy takes the survivors to safety. The mice return to Thorn Valley, Martin returns to normal.

Martin becoming a villain was one of the main aspects of the sequel that has led to it being called one of the worst ever and a disgrace to the original. When the Nostalgia Critic reviewed the movie, he was underwhelmed by it but didn't find anything worth ranting much about until Martin was revealed, which shocked him.