All 13 episodes from the fourth season of the blackly comic American drama series starring Bryan Cranston as Walter White, a high school chemistry teacher turned crystal meth producer. Walter turned to drugs after being diagnosed with lung cancer, hoping to pay off his weighty medical bills and provide for his family in the event of his death. Unfortunately, becoming involved in the drugs industry brings with it numerous complications. In this series, Walter continues his attempts to calm his estranged wife, Skyler (Anna Gunn), and to deter the snooping of his brother-in-law, DEA agent Hank Schrader (Dean Norris). The episodes are: 'Box Cutter', 'Thirty-Eight Snub', 'Open House', 'Bullet Points', 'Shotgun', 'Cornered', 'Problem Dog', 'Hermanos', 'Bug', 'Salud', 'Crawl Space', 'End Times' and 'Face Off'.