Donna and David visit her grandmother in San Luis Obispo. Noting a striking resemblance between David and her late husband, Mrs. Martin tells the couple about her romance with Donna's grandfather, whom she knew for just a few months before he was killed in World War II. Donna and David are touched as they look through Capt. and Mrs. Martin's old pictures and letters. They decide to have faith in their relationship in spite of obstacles such as Felice's opposition. Kelly finds a young boy sleeping on her porch. She reluctantly breaks a promise to the runaway by turning him in to social services, and is wracked with guilt when he vanishes from the shelter. Valerie begins a romance with a hot new movie star, who looks to her for support because he is uncomfortable with the industry. Steve enlists the help of Clare, Brandon and Tracy to film an infomercial for his marketing class.

Music: ""Sing, Sing, Sing"" by Benny Goodman

Valerie becomes depressed when her mom, Jim and Cindy all fail to come to graduation. She tries to make amends with Kelly after overhearing her push Brandon to evict her. Val pleads with Steve to lobby Brandon on her behalf, but he still kicks her out. She checks into a motel across the street from the bluff where she once contemplated suicide. Brandon finds a suicide note and learns Val's probable location from David. Donna ponders taking her relationship with David to the next level. David helps Steve and Muntz with a senior prank. Kelly is furious when her father insists on attending her graduation. The gang receives invitations to a special grad party with a ""roaring '20s"" theme. Kelly's sister Joy confesses that Bill is responsible for the event.

David angers Valerie by moving out of her room and into Carly's old house. She apologizes for her behavior and arranges for a record company executive to watch Jasper's Law perform at the club. The group receives a new record deal, thanks in large part to David's song. Valerie believes that the song is about her, and is hurt to learn that David wrote it for Donna. Donna's grandmother must undergo surgery for an aneurysm. Donna introduces Noah to Mrs. Martin, but she still feels that David is Donna's soulmate. She requests a visit from David and asks him to look out for Donna. Mrs. Martin suffers heart problems after the surgery and soon dies. Val discourages David from attending the funeral, while Noah asks him to spend time with Donna because of their history. Donna and David share a kiss, but decide to remain friends. Kelly meets an ex-convict, who was sentenced to prison at age seventeen for murdering his mother's abusive boyfriend. She asks Brandon to write a story about the man to