After Thanksgiving, Anna (recurring guest star SAMAIRE ARMSTRONG) & Summer (recurring guest star RACHEL BILSON) remain upset with Seth for his behavior on the holiday, & Seth struggles to reconcile with them. Meanwhile, Julie (recurring guest star MELINDA CLARKE) has relationship problems of her own. Jimmy & Sandy team up to tackle Jimmy's legal issues. A secret indiscretion by Kirsten is exposed. Ryan & Luke become partners on a history project, & an astonishing revelation creates an unexpected alliance between them.