In an interview with Doctor Who Magazine (via Doctor Who TV), Simm admitted he’s unsure he’d be asked to play the role again, but acknowledges he was surprised to get the offer to face off with Peter Capaldi’s Doctor.
In the wake of his explosive return in the season 10 finale of Doctor Who, John Simm says he would be open to another turn as the Master.
This thing called Doctor Who is a machine that just sort of goes on its own.
I doubt it. But I don’t know. I mean, I’m very, very lucky to have worked with two Doctors.