Steven Moffat has opened up about his future on Doctor Who.
Entertainment Weekly said Moffat admitted that "statistically he is nearer the end than the beginning" of his tenure.
Moffat added: "I just take it a year at a time. I think the feeling of it being done for you is quite unambiguous when it suddenly arrives."
Matt Smith, who plays the part of The Doctor on the popular show, previously told The Mirror that the show left him tired, saying: "I couldn’t do this for seven years. I’d be run into the ground. I don’t think you can sustain it.
“And your life outside of it is ... I don’t know. I hope I don’t sound too pessimistic.
"It’s just I don’t think my body or my life or the people around me could sustain it.”
Doctor Who returns to BBC1 on March 30.