#24
A chemistry teacher gets diagnosed with cancer and is give a few months to live. He is poor and wants to make sure his family are looked after when he dies so he starts making crystal meth.
Because he is so good at chemistry the meth he makes is the nuts but he has no idea how the world of drugs works so continually fucks up.
It is only 5.0 series and tracks him from mild mannered teacher to Scarface.