Diagnosed with terminal lung cancer, chemistry teacher Walter White teams up with former student Jesse Pinkman to cook and sell crystal meth.

Walter and Jesse scramble to deal with the consequences of their first cook, leading to a tense and unexpected dilemma. Meanwhile, Skyler grows suspicious of Walter's strange behavior.

Walt and Jesse clean up after the bathtub incident before Walt decides what course of action to take with their prisoner Krazy-8.

Walt tells the rest of his family about his cancer. Jesse tries to make amends with his own parents.

Walt rejects everyone who tries to help him with the cancer. Jesse tries his best to create Walt's meth, with the help of an old friend.

As his illness worsens, Walter adopts a more ruthless approach to the drug trade, while Jesse struggles to keep up. Meanwhile, Skyler grows increasingly suspicious of Walter's behavior.

Walter takes a bold step in expanding his operation, forcing Jesse to secure crucial supplies in a risky heist. Meanwhile, Skyler's suspicions continue to grow.