The Third Wheel

Hailey moves in with the Cohens, and proves to be a difficult house guest. Kirsten is unable to confront Hailey about her problematic tendencies, so Sandy takes things into his own hands. Meanwhile, Seth and Anna have a hard time telling Summer about their new relationship and Ryan becomes increasingly jealous about Marissa spending all of her time with Oliver. But when Oliver is arrested at a concert for trying to buy drugs, Ryan is able to enlist the legal help of Sandy.