The Walshes are celebrating their 20th anniversary, and before the evening is over one Walsh twin's life will change forever. Stuart has a surprising suggestion for Brenda, and Brandon startles a gun-wielding Dylan. Meanwhile, Andrea meets a young bartender, named Jesse Vasquez, at the anniversary party. Brandon falls for an anthropologist grad student named Lucinda Nicholson whom he meets at a local gym. David's father, Mel, asks David to look after baby Erin while he takes off somewhere which angers Jackie when she finds out.