Welcome Back, Kotter (1975)

S4E20 Oo, Oo, I Do (1)

Arnold's romance with Mary deepens, taking a significant turn as they grow closer. However, when Arnold learns that he must relocate and leave his school behind, he becomes disheartened. In a moment of emotion, he chooses to propose to Mary, hoping to solidify their bond. To his delight, she agrees to his proposal, marking a pivotal moment in their relationship.