‘Breaking Bad’ Star Bryan Cranston: I Fantasized About Murdering Ex

"I called the police because I was so afraid. I was temporarily insane…"

(Warning: graphic language)

Now we know what darkness Bryan Cranston taps into to play Walter White.

The Emmy-winning "Breaking Bad" star says in a new GQ interview that he once fantasized about murdering an ex-girlfriend who was stalking him, imagining a brutal and graphic scenario.

The difference between Cranston and White, the teacher-turned-kingpin he plays on TV? Cranson didn't actually break bad. He said he called the police because he felt "temporarily insane."

Asked if he believes in evil, Cranston told GQ that he thinks it's "right next to good, inside every person." Then he was asked if he ever encountered it himself.

"I had one girlfriend I wanted to kill," he volunteered.

The magazine said she was an unstable drug addict he briefly dated, and that she followed him to New York when he left Los Angeles to work on the soap opera "Loving. The woman stalked him and left threats on his answering machine: "I'm gonna kill you. I'm gonna cut your balls off. I'm gonna have your dick sawed off."

Then she showed up at his door.

"And I envisioned myself killing her," Cranston said. "It was so clear. My apartment had a brick wall on one side, and I envisioned opening the door, grabbing her by the hair, dragging her inside and shoving her head into that brick wall until brain matter was dripping down the sides of it. Then I shuddered and realized how clearly I saw that happening. And I called the police because I was so afraid. I was temporarily insane-capable of doing tremendous damage to her and to myself," Cranston said.

This puts a darker spin on the "one who knocks" speech: