Eager to help Trey (recurring guest star LOGAN MARSHALL-GREEN) & Ryan repair their relationship, Marissa hosts a birthday party for Trey at Caleb's mansion that quickly gets out of control. After surfing with Carter (recurring guest star BILLY CAMPBELL), Sandy suggests introducing him to a woman friend, to Kirsten's chagrin. When Summer finds out what Seth's potential graphic novel publisher, Reed (recurring guest star MARGUERITE MOREAU), is really like, Seth is in big trouble. & after leaving town in disgrace, Julie returns & surprisingly ends up reminiscing with an old acquaintance.