Walt and Jesse's lives hang in the balance as Gus takes some expensive steps to guarantee that he continues to be supplied with a "pure" product. Meanwhile, Skyler is concerned about Walt's whereabouts, and Marie puts on a happy face to deal with a depressed Hank.

Walt attempts to form a new alliance. Skyler pushes towards a new business opportunity in hopes of protecting the family.

Skyler asks for Saul's help. Meanwhile, Marie returns to an old pastime and a friend asks Hank for help.

The Cartel gain the upper hand. Walt and Skyler share a secret with the family and Jesse's activities draw unwanted attention.

When Jesse goes missing, Walt fears the worst. Skyler has an unlikely reunion. Hank shares some bad news with Detective Tim Roberts.

Skyler makes an unsettling discovery. Meanwhile, Walter Jr. pushes his dad into a questionable purchase and Jesse offers Mike some help.

A frustrated Walt gambles on a risky new plan. Skyler's business venture hits a snag. Hank recruits Walter, Jr. for an unusual outing.

Skyler develops an unusual solution to her money troubles. Hank enlists Walt to investigate a theory. Walt’s impatience with Jesse grows.

Walt drives to Gus's restaurant with an eager Hank to retrieve the tracking bug he left on Gus's car. Hank's suspicious when the bug only shows Gus driving between home and work

Walt's family worries when he doesn't show up for Walt Jr's birthday. Jesse puts his lab skills to the test without Mr White's help.

Walt takes drastic action to protect his secret and Gus. Skyler's efforts to solve Ted's financial problems hit a wall.

Hank pushes Gomez to pursue one last lead, while Walt struggles to protect the family. Jesse gets alarming news and rushes to meet with Mr. White.

A showdown with Gus occurs. Walt finds an unexpected ally through Saul's help.