Bodega owner Marcelino posts one of Jerry's bounced checks on his cash register, along with other bad ones. Jerry pays what was owed, but Marcelino refuses to take the check down, citing his store policy.
Elaine notices her boyfriend Kurt has an attractive head of hair in his driver's license photo; he only shaves his head because he likes how it looks. She persuades him to regrow his hair, but when his first sprouts appear they discover he is going bald. George determines Kurt has 10–14 months before he goes completely bald, and advises him to live life as fully as possible in that time. In observance of this advice, Kurt proposes to Elaine, who accepts.
The Susan Ross Foundation makes a large donation to a women's prison, and George goes there to inspect it. While there he asks out an inmate, Celia, pleased to have found a girlfriend who cannot "pop in" unexpectedly at his place.
Kramer buys what he thinks is a hen for its eggs and names it "Little Jerry Seinfeld", but Jerry tells him it is a rooster. After witnessing the rooster beat a small dog into submission, Marcelino convinces Kramer to enter Little Jerry in a cock fight, which he wins. Marcelino then offers a deal: he will take Jerry's check down if he can have Little Jerry. Kramer refuses the transaction, and Marcelino instead tries to bribe them to have Little Jerry throw his next fight. Insulted, Jerry and Kramer extensively train Little Jerry. At the cock fight, Little Jerry is faced with a huge and skilled opponent. Kramer dives after Little Jerry to protect him, and is violently attacked by the opposing bird.
Celia comes up for parole, so George insinuates to the warden that Celia intends to take part in a heist upon her release. When Celia is denied parole, she breaks out and "pops in" at George's place. She is tracked down and arrested. The officers mistake Kurt for George due to his hair loss, goading Kurt to engage one of them in a fist fight, and Kurt is sentenced to 10–14 months. Elaine realizes that by that time, he will be as bald as George, so she breaks off their engagement.