When Madame Adelaide Bonfamille wills her entire estate to her cats, the greedy butler catnaps and abandons them in the countryside. The charming Thomas O'Malley, a rough-and-tumble alley cat, saunters by and offers to escort them home. Along the way, they stop at Thomas' 'pad' where Scat Cat and his band of swingin' jazz cats are having a jam.