Haunted by a citywide tragedy, Walt vows to quit his criminal life and mend his family -- unaware that a ruthless threat is already on its way to Albuquerque.

Walt's traffic stop escalates, he tries to mend his family, and Jesse, with Saul's help, seeks a fresh start as two mysterious men close in.

Walt presses back into the family home, pushing Skyler toward a pivotal decision, while Jesse charts his own course as unseen threats draw closer.

With his home life crumbling, Walt's reckless moves threaten his job as Jesse tests a new plan, while Hank intensifies the hunt for blue meth.

Walt weighs a lucrative proposal as Skyler reevaluates their future, Jesse rebuilds his operation, and Hank's pursuit of the blue meth network intensifies.

Walt starts work in a new lab with an assistant, while Hank's search for Heisenberg closes in on an old RV, setting in motion a tense cat-and-mouse at a scrapyard.

Tempers flare across Albuquerque: Walt faces a new lab dynamic, the DEA reels from a reckless act, and a silent threat closes in -- culminating in a chilling countdown.

A family crisis draws Walt to the hospital while Jesse covers the lab; a surprise visitor in the waiting room raises the stakes.

As mounting medical bills strain the family, Skyler devises a plan; Walt and Gus find tentative common ground, and Jesse seeks independence through a new opportunity.

Walt obsessively hunts a fly in the lab, halting production and testing his partnership with Jesse.

Skyler moves to legitimize Walt's cash with a business front, clashing with Saul's flashy ideas; meanwhile, Jesse's search for customers at his support group leads to an unexpected bond.

Street tensions spike as Jesse pursues a risky plan against rival dealers, pressuring Walt to choose between caution and loyalty, revealing the cost of 'half measures.'

With the lab's future in doubt, Walt and Jesse navigate a dangerous power play that forces a defining choice about loyalty and survival.