13 Episodes · Premiered July 17, 2011 · Ended October 9, 2011
As his young accomplice, Jesse, turns increasingly distant and hostile, Walt must deal with his estranged wife, his relentless DEA agent brother-in-law, and the ruthless kingpin manipulating the entire operation.
In the Season 4 opener, Walt and Jesse are confronted by the life-threatening consequences of their actions. Meanwhile, Skyler contends with a puzzling disappearance, and Marie finds it difficult to help a recovering Hank.
Walt tries to establish a new alliance as he plots his next move. Meanwhile, Skyler urges Walt to consider a business opportunity that could keep the family safe.
Goings-on at Jesse's place start to get out of control; Skyler reluctantly turns to Saul for help; Marie settles back into an old habit; and Hank hears from an old friend who needs assistance.
The Cartel makes a power move; Skyler and Walt reveal something embarrassing to the family; and Jesse's misdeeds bring some unwanted attention.
Jesse's disappearance leaves Walt fearing the worst; Skyler has a surprising reunion; and Hank gives Det. Roberts bad news.
A shocking discovery unsettles Skyler; Walter Jr. leans on his father to make a special purchase; Mike gets surprise help from Jesse.
A frustrated Walt takes on a risky gamble; Skyler encounters problems with her latest business venture; Hank requires Walter Jr.'s services for an unusual reason.
Skyler devises a plan to cure her money woes; Hank recruits Walt to help him work out a theory, while Walt grows impatient with Jesse.
Mistakes from Skyler's past prove to be impactful to the present; Gus is spurred to action against rivals; Jesse seeks help from Walt but the results are mixed.
The family becomes gravely concerned when Walt doesn't show up for his son's 16th birthday celebration. And Jesse's lab skills are tested in Walt's absence.
Walt moves to protect his secret and Gus; Skyler is stymied in her attempt to help Ted with his financial problem.
Hank leans on Gomez to explore one final lead, as Walt scrambles to protect his family. Meanwhile, Jesse learns some unsettling news and races to share it with Walt.
The fourth season ends with Walt and Jesse squaring off against Gus. Elsewhere, Walt acquires a surprise confederate with help from Saul.
