Timothy Brisby is the second son of Mrs. Brisby, the younger brother to Teresa and Martin, and the older brother of Cynthia. He is voiced by Ian Fried as a 6 year old, Andrew Ducote as a 10 year old, Alex Strange as a 13 year old, and Ralph Maccacio as a 17 year old.

The Secret of NIMHEdit

For the majority of the first film, Timmy is bedridden and suffering from pneumonia. He is treated with medicine from Mr. Ages from his mother within the first 25 minutes of the movie. And he cannot be moved from bed for three weeks until he recovers; this is problematic due to the fact that Moving Day is approaching and, normally, the family would be moved out of harms way until the plowing has finished. But because of his condition he cannot be moved out of bed. So his mother seeks the aid of The Rats of NIMH to move her house to the Lee of The Stone to avoid Timothy from getting out of bed. After the house has moved, he speaks his first and final line: "Mama, I'm tired of bed. I want to get up!" to which his mother replies: "Well, you're not getting up". Much to his disappointment.

The Secret of NIMH 2: Timmy to The RescueEdit

Although he is not given a significant role in the first movie, he is the protagonist of the sequel Timmy to The Rescue. In the sequel, he is sent to Thorn Valley to learn in the rats way of life and become like his father, Jonathan Brisby.