Actor David Tennant has hinted that he may be set to quit the 'Doctor Who' series.
In an interview with Doctor Who magazine, the actor said: "I think I now know how many series I'm going to do."
"I think it would be stupid of me to say more than that right now, before this series has even begun filming. Anything can happen, and everything can change."
Tennant also admitted that he is missing his former co-star Billie Piper since she left the show.
"Billie was the only other cast member there every single day, and we relied on each other professionally, and personally, and I do miss her a lot," he said.
