A former high school chemistry teacher, Walter White, has been diagnosed with cancer and has been in chemotherapy. He is no longer a chemistry teacher at a high school, and now he is the Kingpin, hunted down by the DEA. He manufactures blue crystal methamphetamine and is Jesse Pinkman's mentor. Walter adopts the alias "Heisenberg." He has a lawyer named "Saul Goodman," a colourful drug lawyer and legal fixer for Walter White, later the focus of "Better Call Saul."