For "Doctor Who's" more than six-decade history ... I'm very keen on a slightly kind of '70s vibe, which is where the leather coat came from. I just wanted that '70s New York feel.

Nearly 50 years later, he found himself cast as the creepy Dr. Mauer, who worked closely with Mark's wife Gemma in the underbelly of Lumon in the second season of Severance. So how did the role ...