Michael "Mike" Ehrmantraut is a character who appeared in Breaking Bad and it's 2015 spinoff/prequel, Better Call Saul. He was the primary mechanic, fixer and enforcer in Gus Fring's minimally staffed crystal meth operation. He becomes the secondary antagonist of Season 4 and the main antagonist of the first half of Season 5. He was portrayed by Jonathan Banks. Also an associate of Saul Goodman, he had served Saul as a private investigator and fixer, a go-to guy for sticky situations.