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

One body dissolves in acid while another dealer lies captive. Walt and Jesse scramble to erase evidence, and Walt faces whether he can kill to keep the fledgling operation and keep Jesse safe.

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.

Shaved and reborn as Heisenberg, Walt crashes Tuco's lair with explosive mercury fulminate, swapping chemistry for intimidation. The violent payoff bankrolls chemo but draws Hank's attention.

Under pressure from a dangerous new customer, Walt and Jesse race to expand their operation, hatching an audacious plan for crucial supplies as Walt struggles to keep his double life from collapsing.