It has been nearly 10 years since "Doctor Who" was brought back, and producer Russell T. Davies did a lot to shape what the current show looks like.

The former showrunner recently explained he would not be working on any 10th anniversary specials for the series. 

"Someone from the [BBC's] branding team sent me a very lovely email saying do you want to do something," he said, according to Den of Geek. "I don't know what they imagined: a talk or a convention perhaps. I just said no, to be honest. A program can't have its 50th and then its 10th."

The show started in the 1960s, and it was brought back in 2005, after not airing new seasons in about 16 years. Davies said a 10th anniversary would make things confusing.

He added current showrunner Steven Moffat invites him to write an episode every year, but he is "moving on."

"I love 'Doctor Who' with all my heart, but nothing is more important to me than my own stuff," he said.

He is currently working on "Cucumber," "Tofu" and "Banana," which aim to look at gay life in Britain.

Davies worked with current Doctor Peter Capaldi in a season four episode, and in an interview with RadioTimes.com, he admits he wishes he had cast Capaldi as the Time Lord.

"I know Peter Capaldi," Davies said. "He did a 'Doctor Who' with us, and he did a brilliant 'Torchwood,' and when they cast him I was just envious. I just thought: so brilliant. Why didn't I think of that? Brilliant."

Season 9 of "Doctor Who" will air in 2015. For most of its last season, there was speculation that Jenna Coleman, who plays companion Clara Oswald, would leave the show. During the Christmas special, which was aired on Dec. 25, 2014, it was revealed she would return.

"It's wonderful," Coleman said to BBC News. "I get a whole other series of stories with the Doctor, and I couldn't walk away with the story being unresolved."