Fiona is confused by the status of her relationship when Gus announces he's leaving to go on tour. Meanwhile, Carl is asked by his boss to run drugs to Indiana; Frank sees a way to get revenge on Sammi by using Chuckie as the mule and having him busted; and Lip, still in need of tuition money, convinces Kev to come to the dorms and sell drugs. Plus, as Ian refuses to accept his bipolar diagnosis, Debbie is tasked with minding his new meds