Courage of the heart is very rare. The stone has a power when it's there.
~ Nicodemus

Jonathan Brisby was killed today while helping with the Plan. It is four years since our departure from NIMH, and our world is changing. We cannot stay here much longer. Jonathan was a dear friend. I am lost, knowing how to help his widow. She knows nothing of us, or the Plan. Perhaps best that I do nothing at present. I shall miss him. Jonathan, wherever you are, your thoughts must comfort her tonight. She'll be waiting, and you will not return. friend.
~ Nicodemus' opening narration.

Nicodemus is a major character in The Secret of NIHM. He is voiced by Derek Jacobi.

Nicodemus was the wise, old, and magical leader and ruler of the rats who escaped from NIHM.The rats of NIHM were experimented on until they eventually developed human level intellect. Nicodemus became the most intellectually gifted among his kind so when the rats escaped their cages Nicodemus was made their leader.

Nicodemus gives Mrs. Brisby a mystical charm of his and offers to save her family to repay the kindness of her husband, Jonathan Brisby, who was interested in helping the rats escape NIMH. By the end of the film Nicodemus dies in his attempt to save the Brisby family.

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