Original air date: 01/11/2012 Runtime: 41:59 min. In the season premiere, as Brooke and Julian begin to adjust to life with their new children, Haley and Nathan find themselves dealing with similar issues. Although they don't know it yet, faces from the past threaten to interrupt plans for all their futures. Meanwhile, a mysterious problem arises for Clay and Quinn.
Original air date: 01/18/2012 Runtime: 41:49 min. Brooke discusses a new business venture with her father (recurring guest star RICHARD BURGI Desperate Housewives), as Julian stresses about his own investment. Quinn convinces Clay to get help, and Millie struggles to be honest with Mouth. Meanwhile, Chris Keller makes Alex (recurring guest star JANA KRAMER) an offer she may not be able to refuse and Nathan volunteers to scout in Europe, leaving Dan with Haley and Jamie.
Original air date: 01/25/2012 Runtime: 41:56 min. Dan helps a struggling Haley at Karen's Cafe. Meanwhile, Quinn discovers that Clay is hiding something from her, and Chase tries to mend a broken heart. Brooke is let down by her lunch plans with her dad, and Julian makes a life-changing mistake.
Original air date: 02/01/2012 Runtime: 42:04 min. As Julian deals with his guilt, Brooke helps Haley confront a new rival cafe and its difficult owner. Meanwhile, Chase's new girl has a complicated secret, and Quinn takes extreme measures to help Clay realize he's worse off than he thought.
Original air date: 02/08/2012 Runtime: 41:25 min. As Quinn distracts Jamie, Haley searches for Nathan. Clay finally gets answers about his condition. Meanwhile, Julian attempts to get back to a normal life, while Brooke tries to give Tara (recurring guest star CHELSEA KANE Dancing with the Stars) a chance.
Original air date: 02/15/2012 Runtime: 41:55 min. Dan enlists Julian to help in his search for Nathan. Mouth fills Clay in about Nathan, as Haley explains Nathan's disappearance to Jamie. Brooke gets an idea of how to bring patrons to an empty Karen's Cafe, and Chris Keller confronts Chase about Tara (recurring guest star CHELSEA KANE).
Original air date: 02/22/2012 Runtime: 42:07 min. Haley seeks help from Lucas (guest star and former series star CHAD MICHAEL MURRAY) as Nathan makes an escape attempt. Brooke comes face to face with Xavier (recurring guest star DEVIN McGEE). Julian uncovers evidence that assists Dan in his search for Nathan. Clay makes a connection with another patient.
Original air date: 03/07/2012 Runtime: 41:45 min. Brooke and Julian take new measures to protect their family. Skills (recurring guest star ANTWON TANNER) helps Mouth get to a turning point, and Chase faces consequences for defending Chuck (recurring guest star MICHAEL MAY). Clay reaches a new understanding with Logan (recurring guest star PIERCE GAGNON). Meanwhile, Haley partners with Dan in his search for Nathan's whereabouts.
Original air date: 03/21/2012 Runtime: 42:04 min. The search for Nathan becomes increasingly dangerous, and Dan's life hangs in the balance. Brooke is surprised when her father (recurring guest star RICHARD BURGI) returns. And Clay and Quinn reconnect with Logan (recurring guest star PIERCE GAGNON).
Original air date: 03/28/2012 Runtime: 41:38 min. As Haley prepares to emcee the annual Tree Hill Burning Boat Festival, Brooke uses the opportunity to process her father's betrayal, while Julian tries to breathe new life into a past idea. Mouth and Millie make a change to their morning show, and Clay and Quinn get ready for Logan's (recurring guest star PIERCE GAGNON) first night at the beach house.