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Mike Ehrmantraut, the cunning, formidable and world-weary former cop, is key to 'Better Call Saul'

Season 4 will see 'Better Call Saul' inch into 'Breaking Bad' territory and Mike Ehrmantraut playing a vital role

One can get a glimpse into a facet of Mike Ehrmantraut's (Jonathan Banks) persona through how he says he perceives the difference between criminals and villains. "I've known good criminals and bad cops. Bad priests. Honorable thieves," he says. "You can be on one side of the law or the other. But if you make a deal with somebody, you keep your word. You can go home today with your money and never do this again. But you took something that wasn't yours. And you sold it for a profit. You're now a criminal. Good one, bad one? That's up to you."

One of the more prominent supporting characters in 'Breaking Bad,' he is now set to play an equally pivotal role in the fate of 'Better Call Saul.'