Sandy & Caleb confront Kirsten about her behavior. Ryan heads home to Chino, as he looks for the truth about Trey (recurring guest star LOGAN MARSHALL-GREEN) & Marissa. Meanwhile, Summer refuses to let her three-way relationship with Zach (recurring guest star MICHAEL CASSIDY) & Seth stop her from attending the prom. &, Julie & Caleb toast to their final evening together as husband & wife.