During spring break, Donna visits Ray now living in Portland, Oregon and David tags along to visit his mother only to learn that she has disappeared. So David, along with Donna and his father, Mel, follow a strange trail of the past to find her, while Ray begins to show increasingly signs of jealousy over Donna helping David find his mother. Back in Beverly Hills, Dylan undergoes hypnosis by a therapist in his research to find ideas for a screenplay for Charlie, while Valerie considers and gets a tattoo for herself.

Brandon and Susan cover the Tournament of Roses Royal Court tryouts in which Kelly, Donna, and Clare are candidates. After his successful return to the stage, Ray gives a command performance to the 11-year old daughter of a record company president. Meanwhile, Toni begins to get to Dylan while he develops feelings for her. Also, Kelly becomes jealous when Colin attends the Rose Ball with Valerie, and Steve tries to find an out to his math tutoring from Clare by tapping in on an Internet dating system.

After David's mother attempts to kill herself, it turns him into a recluse and it brings back bad memories for Valerie over her father's suicide. Meanwhile, Toni invites Dylan and his friends over for dinner at her father's mansion where Toni's bodyguard, Bruno, confronts Dylan that he and Marchette know all about him and his father. Also, Brandon finally negotiates a date with Susan, but dating and newspaper politics sometimes don't mix. Elsehwere, Nat and his chef, Willie, try to catch an elusive mouse at the Peach Pit that's hurting their business, until Donna comes to their rescue.

Donna invites NFL quarterback Steve Young over at Casa Walsh for Thanksgiving, one of two surprises she plans for Joe's birthday on that same day. But Donna later learns that she and Joe have a thing in common: they both disapprove of premarital sex. Meanwhile, the absence of Susan and Colin weigh on Brandon and Kelly who find old feelings returning to each other. Steve becomes a surprise hit at Clare's father's faculty party. Also, Valerie disdains cooking help from David's mentally unbalanced mother.

During an argument with Donna in the student union, David throws a tantrum and cuts his hand on a glass. He must see a psychiatrist after displaying hostile behavior toward the ER staff. Mel agrees with the doctor's recommendation that David be held 72 hours for observation. David is diagnosed with a mild form of manic depression. His mother comes to see him and advises him to moderate his behavior; he will not require medication if he seeks therapy and stops drinking. David thanks Donna for her support and they decide to get back together. Steve faces plagiarism charges; Professor Randall, who assumed control of the independent study course after returning to CU, recognized Brandon's writing. Randall still holds a vendetta against Brandon and brings collusion charges against him. Kelly and Mark's plans for a romantic weekend getaway are foiled by a lost reservation. They finally secure a motel room, only to come down with food poisoning. The gang helps Willie build a house that his family will receive from Habitat for Humanity. Val displays construction skills as a result of working with her contractor father, but hints to Clare that she has few happy memories of her dad. Everyone eats Thanksgiving dinner inside the unfinished house.