Andrew Ducote

To follow in his father's footsteps and become a hero, Mrs. Brisby's son Timmy heads off to live with the rats of NIMH. When he learns that a group of mice is still imprisoned inside the testing lab, Timmy sets up a daring rescue.

The rats and mice, made intellectually superior in the original Secret of N.I.M.H., return to Thorn Valley to groom their destined leader - young Timmy Brisby.