The episode picks up immediately after the previous episode’s cliffhanger: Walt (Bryan Cranston) has just revealed his cancer diagnosis to his pregnant wife, Skyler (Anna Gunn), who is emotionally shattered. Meanwhile, his DEA brother-in-law Hank (Dean Norris) shows Walt a news report about drug kingpin “Cap’n Cook”—actually Walt’s partner Jesse Pinkman (Aaron Paul)—using their signature blue meth. The real threat, however, comes from rival dealer Tuco Salamanca (Raymond Cruz), who beat Jesse nearly to death and stole their meth without paying.
Walt chooses this pseudonym as a nod to physicist Werner Heisenberg, known for the "uncertainty principle". 🏆 Reception and Impact breaking bad temporada 1 episodio 6