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Isis was Catwoman's pet house cat.
Catwoman is shown to keep many cats, among those is her favorite cat, Isis. One addition to the mythos was giving Catwoman a pet black cat named Isis, who appears in the first series and in The New Batman Adventures. As Catwoman's cat, she fights the dogs of Superman and Batman, as well as Streaky the Supercat, on Krypto the Superdog, a cartoon made by the same people who made the DCAU. Isis also appears briefly in The Batman.