Jonathan Banks portrayed Mike Ehrmantraut throughoutBreaking Bad,and the actor's favorite scene was made even sadder by his Better Call Saul story. Mike was introduced in Breaking Bad season 2, and he became a staple of the AMC series — so much so that Banks reprized the role in its prequel show. Better Call Saul dug deeper into Mike's backstory, as he used to be a crooked cop before joining Gus Fring's business. Mike's history came to haunt him after his son was killed by corrupt officers, and that's why he gave most of the money he made to his granddaughter.