The rivalries, responsibilities and relationships reach new heights in Chapter Four of the ABC Family original series Greek. Guest star Jesse McCartney joins the cast for a semester of surprises at Cyprus-Rhodes University. When Rusty convinces the school's most sought-after rushee (McCartney) to pledge his house, sparks begin to fly at Kappa Tau, and old friends collide when new drama threatens the friendships of Casey, Ashleigh, Frannie's and the rest of your friends on Greek row.