Marissa and Ryan try to start over as friends, but it's not as easy as it seems. As Theresa begins spending more time in Newport, Ryan discovers that she hasn't been honest about why she's there. Seth believes his relationship with Summer is going great, but when she refuses to acknowledge him at school, he feels he has to teach her a lesson. Meanwhile, Sandy finds himself embroiled in another mess created by Caleb, while Jimmy begins to suspect something is amiss with Julie and Luke.