S1, E20: Marissa and Ryan try to make a new start as friends, but it's not as easy as they had hoped. As Theresa, Ryan's ex-girlfriend from Chino, begins spending more time in Newport, Ryan discovers that she hasn't been completely honest about why she's there. Elsewhere, Seth believes his relationship with Summer is great, but when she refuses to acknowledge him at school, he feels he has to teach her a lesson.