Doctor Whoseason 10 has finally arrived. After quite a long break, the beloved BBC sci-fi series has returned withPeter Capaldiback as the Doctor. But that means the clock is officially winding down on his tenure with the series, as he is departing the role following this season. The announcement was made a few months ago thatPeter Capaldiwill be leaving the role of the Doctor behind, but now the actor has explained why it is he chose to leave.

Peter Capaldirecently appeared onThe Graham Norton Showand he was asked aboutDoctor Whoseason 10. Specifically, why it is he decided to bail on being aTime Lord. Fans will probably be happy to know that he is leaving because he wants to go out on top, at least from an acting perspective. Here is what he had to say about it.

“Doctor Who is a great job, but it is a bit of a television factory. You do twelve episodes a year, and I just worried that I wouldn’t be able to continue to do my best work. I like to be able to learn the lines and do some preparation and come in and give it some vigor and not hate it. I just figure, while you’re enjoying it, leave.”

From the perspective of an actor, it is a little hard not to understand where he is coming from.Doctor Whois one of the longest-running shows in the history of television, even though there have been breaks here or there. But this latest iteration has been going strong for a good while now and, as he points out, it is something of a well-oiled machine. For the viewer, the Doctor is the most important part of that machine. But forPeter Capaldi, he is just a cog and that can probably run the risk of getting a bit repetitive if you do it for too long. And three seasons onDoctor Whois a pretty good run.

It hasn’t yet been revealed who will be taking over the role of the Time Lord afterDoctor Whoseason 10, but some favorites have emerged. Early chatter hadSkyfallstarBen Whishawas the favorite, but there is also quite a bit of talk that thenext Doctor Whocould be played by a female, which would be the first time that has happened in the history ofDoctor Who. The actress who has been pegged as the favorite, should that happen, isDoctor StrangestarTilda Swinton. Now that the show is back on the air, we may find out sooner rather than later whoPeter Capaldi’s replacement will be.

Doctor Whoseason 10 will also beSteven Moffat’s last as the showrunner. ComeDoctor Whoseason 11, it will beBroadchurchshowrunnerChris Chibnallin charge. It still hasn’t been announced if the current companion Bill (Pearl Mackie), who happens to be the firstopenly gay companionin the history of the series, will be back next season, but if they do swap her out,Doctor Whowill be looking quitea bit differentnext year.Doctor Whoseason 10 consists of 10 episodes, with the first episode having already aired on April 15.Doctor Who’s next episode will air this Saturday on BBC. you may check out the interview clip for yourself below.