The side effects of chemo begin to plague Walt. Meanwhile, the DEA rounds up suspected dealers.

Walt and Jesse find themselves in close quarters with an unhinged Tuco. Marie and Hank comfort Skyler, who is distraught over Walt’s disappearance. Hank pays a visit to Mrs. Pinkman on some not-so-official business.

As the end of her pregnancy finds Skyler conflicted about her feelings, a dealer's death forces Walt to look for somewhere to unload a load of meth.

Walt ignores Skyler's demands, furthering the rift between them and pushing her to break bad. Still suffering from panic and anxiety attacks, Hank crosses a line at work.

As Hank's hospital bills stack up, Skyler hatches a plan. Walt and Gus come to a better understanding. Jesse, looking for more independence, pursues a new opportunity.

Walt attempts to form a new alliance as he plans his next move. Skyler pushes Walt towards a business opportunity, in hopes of protecting the family.

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

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

Walt's team gets creative to obtain the methylamine they need to continue their operation.

Things heat up for Walt in unexpected ways.