Diff'rent Strokes (1978)

S02E21 Valentine's Day Retrospective (a.k.a.) Valentine's Vigil

Arnold and Willis find themselves stuck in the basement, passing the time by reflecting on their recent experiences, both joyful and challenging. Arnold is adamant about wearing his Superman costume for the family’s Valentine's Day outing to the circus, prompting a frantic search that ultimately leads them to the basement and a locked door. The episode showcases some of the most memorable moments from earlier episodes, capturing the essence of their adventures together.