MoviesOnCable.com

A timid, widowed field mouse named Mrs. Brisby is faced with a crisis: her youngest son Timmy is sick in bed with pneumonia, and cannot be brought outside his home, a cinder-block house on a farm. But she must move her family to safety before the block is crushed in the farmer's spring plowing. She consults the wise Great Owl for advice, and he sends her to see the rats of NIMH, a society of superintelligent beasts living in the farmer's rosebush. The rat leader Nicodemus informs Mrs. Brisby that her late husband helped the rats escape from the NIMH lab where they had received the injections which altered their minds, and that he was delighted to have an opportunity to help the widow of their hero. Nicodemus also describes the rats' Plan to live like productive humans, without stealing from the farmer, by moving to a faraway wilderness called Thorn Valley. While Mrs. Brisby puts a sleeping powder in the bowl of the farmer's cat, the rats attempt to move her house with ropes and pulleys. But there are treacherous rodents in the group who oppose Nicodemus' aim to move, and one of them, Jenner, cuts the lines so the poles and pulleys crash down right onto Nicodemus and kill him. A furious swordfight between Jenner and Justin, the rats' Captain of the Guard, ends in Jenner's death by the hand of his own accomplice Sullivan. But now the fallen cinder block begins sinking into the mud, putting the Brisby children in grave peril. Mrs. Brisby, having escaped from a birdcage where she'd been locked (after being caught in her cat-drugging by the farmer's son), uses a magical amulet given to her by Nicodemus - a stone brought to fiery life "when worn by one with a courageous heart" - to raise her home out of the mud and guide it to a safe spot on the farm, the "lee of the stone." She had found a degree of courage that had eluded her up until this point Plot summary from IMDb.com, written by Rick Stearns
-- Synopsis from IMDB