S4, E10: Chuck, Serena, Blair, Dan, Jenny and Eric (recurring guest star CONNOR PAOLO) find themselves faced with a crisis when a member of one of their families is hospitalized. Meanwhile, Nate attempts to help his parents, the Captain (recurring guest star SAM ROBARDS) and Anne (recurring guest star FRANCIE SWIFT), put their complicated past behind them and reconcile. Recurring guest star KATIE CASSIDY appears as Juliet.