Ryan struggles with the decision of whether or not to invite Marissa to his birthday party, & Sandy wants to include one of Ryan's relatives in the celebration. Meanwhile, Julie & Dr. Roberts (recurring guest star MICHAEL NOURI) come clean with Summer & Marissa. Also, Ryan & Sadie (recurring guest star NIKKI REED), along with fellow new couple Marissa & Volchok (recurring guest star CAM GIGANDET), grow closer.