Michael "Mike" Ehrmantraut is a fictional character in Breaking Bad and its spin-off series Better Call Saul. He is portrayed in both series by Jonathan Banks.Mike is a former Philadelphia police officer who, publicly, works as the Head of Corporate Security at Los Pollos Hermanos; in reality, he is an assassin and enforcer in Gus Fring's crystal meth operation. On occasion, he works for Saul Goodman as a private investigator, cleaner, and fixer.