S2, E3: Serena and Dan are forced to deal with their unspoken problems while trapped in an elevator during a citywide blackout. In a humorous twist, Blair questions the lack of passion in her relationship with Marcus (recurring guest star PATRICK HEUSINGER), while, at the same time, Chuck appears to have lost his "passion" for any woman other than Blair. Meanwhile, Nate struggles between his feelings for Vanessa and his more-complicated-by-the-day relationship with Catherine (recurring guest star MADCHEN AMICK). Plus, Jenny risks losing her internship when Eleanor (recurring guest star MARGARET COLIN) catches Jenny critiquing one of the Eleanor Waldorf designs.