It's Mark's 13th birthday.While frank introduces him to the fine art of shaving,and Carol arranges a real party for him with music and girls.One of the girls is a lovely girl named Marissa,with who Mark falls in love with.But he's soon brokenhearted as he finds out her feelings for him are not quite the same as what he thought. J.T. passes his mechanics exam.But Dana feels if he can do it so can she.So she challenges him to a bet,that she can do it.