 Rich, eccentric T.J. Banner adopts a feral cat who becomes an affectionate pet. Then T.J. dies, leaving to Rhubarb most of his money and a pro baseball team, the Brooklyn Loons. When the team protests, publicist Eric Yeager convinces them Rhubarb is good luck. But Eric s fiancée Polly seems to be allergic to cats, and the team s success may mean new hazards for Rhubarb.