Sullivan was Jenner's fat and somewhat dull-witted partner-in-crime. He reluctantly followed the black rat in his plot to kill Nicodemus, but later turned on Jenner during the final battle, which ended with a mutual kill between him and his former master. Although Sullivan doesn't really appear in Mrs. Frisby and the Rats of NIMH he is mentioned briefly in Nicodemus's flashback.
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Sullivan
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