Walter White is a high-school chemistry teacher diagnosed with terminal lung cancer. To secure his family’s financial future, he turns to cooking and selling methamphetamine with former student Jesse Pinkman. As Walter’s double life deepens, he adopts the alias “Heisenberg” and becomes increasingly ruthless. Seasons 3 and 4 chart his transformation from a desperate man into a calculating drug kingpin, while his relationships with Jesse, his wife Skyler, and DEA agent Hank Schrader grow more strained and dangerous.

Season 3 (2010)

• Episodes: 13

• Original Run: March 21 – June 13, 2010 (AMC)

• Key Arcs:

  • Walter clashes with distributor Gus Fring and lawyer Saul Goodman enters the fold.

  • Jesse struggles with guilt after killing Gale Boetticher’s partner, Combo.

  • Skyler grows suspicious of Walter’s lies and confronts him about his second phone.

  • Hank’s investigation into “Heisenberg” intensifies after finding a lab notebook.

  • The season ends with Walter poisoning Brock to manipulate Jesse and eliminate rival dealer Tuco’s cousins.

Season 4 (2011)

• Episodes: 13

• Original Run: July 17 – October 9, 2011 (AMC)

• Key Arcs:

  • Walter and Gus engage in a deadly game of cat-and-mouse.

  • Jesse is forced to work in Gus’s underground super-lab under Mike Ehrmantraut’s watch.

  • Skyler becomes complicit in Walter’s money-laundering through the car wash.

  • Hank recovers from his shooting and resumes hunting Heisenberg.

  • The season culminates in Walter’s iconic line, “I won,” after orchestrating Gus’s death via a hospital bomb