Brutus
Brutus is the backup doorguard and he rejects Mrs. Frisby from getting in the first time but when she finds Mr. Ages walking into the rosebush they try again and Brutus then realizes that Mrs. Frisby is Jonathan's wife and he apoligizes for not letting her pass. Later in the boook, Brutus inhales some of the poisonous gas the exterminators who are trying to kill the rats and begins to constantly fall down.Another rat then helps Brutus outside but he still falls until he lands in front of some saplings and stops moving. He was not dead but unconscious until Mr. Ages gave him medicine and Brutus woke up and asked how he got there.