Family Guy Season: 3
Family Guy Episode: 11
Episode Air Date: November 8, 2001
Episode Description: After delivering Lois's sister's newborn child, Lois and Peter decide to have another baby, prompting Stewie to do whatever he can to stop it, even if it means shrinking himself and wiping out every sperm in Peter's testicles. However, when he meets a sperm just like himself, Stewie begins to reconsider.