" Breaking Bad " creator Vince Gilligan cast Bryan Cranston for the role of Walter White based on having worked with him in an episode of what previous television series ?
He collaborated with costume designer Kathleen Detoro on a wardrobe of mostly neutral green and brown colors to make the character bland and unremarkable , and worked with makeup artist Frieda Valenzuela to create a mustache he described as " impotent " and like a " dead caterpillar " .