Dan (Paul Johansson), Julian (Austin Nichols) and Chris Keller (Tyler Hilton) attempt to rescue Nathan (James Lafferty). Brooke’s conflict with Xavier (guest star Devin McGee) escalates. Quinn (Shantel VanSanten) and Clay (Robert Buckley) revisit the past. Sophia Bush, Bethany Joy Galeotti and Lisa Goldstein also star.