Beaking Bad has this awful lawyer ( Saul Goodman).
Vince Gilligan purposely chose comedians for bit parts,
and his was the lollipop scene just before the Feds clean out Mike for the second time
and did so well, that he was written into the series.
Vince bowed to demand to show how Saul went from moral to awful. There are more series than BB
Series one ep 1 - is Saul at the take away (B+W) which I thought was the end ( ring cycle very classical) but isnt, it is his beginning
and then a house being sold up - which is obviously Saul going bankrupt in the future, and WILL be the end
we KNOW he is gonna crash and burn
and has various adventures in which he ALMOST does
The only real problem with a prequel is that they are meant to look younger and no amount of slap will make any of the actors look anything besides shogged