Walter White is a high school chemistry teacher who is diagnosed with lung cancer. He resorts to cooking meth with Jesse Pinkman, a former student of his, in order to provide for his wife and son.
Walter is the main character of the AMC drama Breaking Bad. He is a high school science teacher with a wife Skyler and a son Walter Jr. Walter discovers he has irreversible lung cancer, and initially keeps it from his family, although they eventually find out. Walter's brother in law is DEA agent Hank Schrader, who takes Walter on a ride along one day to see him bust a meth lab. Seeing the lab, and how much money can be gained from cooking meth, Walter decides he is going to cook it in order to have money to leave to his struggling family. A former student of his, Jesse Pinkman, whose lab was busted by Hank, helps Walter get into the business. Walter's background in chemistry allows him to cook a very high quality product.
When we first see Walt he is timid, underwhelmed, and disengaged by most things in his life. The passion of his everyday has been taken from him after years of an unrewarding job and vanilla life choices. After being diagnosed with cancer we see a new side to Walt, and possibly shades of a younger more vibrant Walt.
His choice to begin cooking meth thrusts Walt into a world he has only heard or read about. Despite being an old white dude he acclimates quickly becoming the best meth cook known as well as a ruthless killer. Even if some of the rumors are initially overblown Walt grows into his new moniker. Slowly we see Walt forced to do darker and more violent things in order to either keep his meth cooking a secret or to protect his family. We see him stand up for morals and values he claims to have only to break them later down the line.