For most of Breaking Bad’s run, Walter White’s lawyer hid behind his carefully cultivated Saul Goodman persona; he only returned to his true identity as Jimmy McGill in one episode. Bob Odenkirk first debuted the character of Saul in Breaking Bad season 2, episode 8, “Better Call Saul.” After Badger was arrested for selling Walt and Jesse’s product, Jesse insisted that they didn’t need a criminal lawyer; they needed a *criminal* lawyer, so they recruited Saul’s unscrupulous services. Saul ended up serving as Walt and Jesse’s lawyer and money-laundering consultant for the rest of the series.

https://screenrant.com/breaking-bad-granite-state-saul-goodman-jimmy-mcgill-op-ed/