Walt is diagnosed with terminal lung cancer and begins cooking meth with former student Jesse Pinkman. Jan 27, 2008

Here are the episodes:

Walt faces a moral crisis as he holds Krazy-8 captive in Jesse's basement. Feb 17, 2008

Walt reveals his diagnosis to his family; Hank and the DEA investigate a new meth kingpin. Feb 24, 2008

Walt’s left hand (the one he cut) resting on a bag of money. His right hand (the one he raised Holly with) holding Jesse’s bloodied hand. The cancer is shrinking. The soul is gone. Season 2 would begin with the pink teddy bear in the pool.

Walt refuses financial help from former partners; Jesse tries to expand their business solo. Mar 2, 2008