Billie Piper had divided loyalties when returning as Doctor Who companion Rose Tyler for the 50th anniversary special, according to showrunnner Steven Moffat.
The executive producer and lead writer said Piper felt “torn and divided” over working with both Matt Smith and David Tennant because she is good friends with both of them.
“Seeing Billie and David standing on set together was quite epic,” said Moffat. “Billie told me that as she is very good friends with both Matt and David, she felt quite torn and divided. She didn’t know how to deal with both of them at the same time, so if she was talking to one, she would stroke the arm of the other.”
In the interview, released by the BBC, Moffat says that the episode The Day of the Doctor will be more than “just a celebration of 50 years of the past”.
“I wanted it to be a celebration of the mythology and legend of the Doctor and all that entailed,” said Moffat.
“This should be the first step on the next journey, guaranteeing the 100th anniversary. The story focuses on the most important thing that ever happened to the Doctor. We very rarely do that in Doctor Who as it’s usually about the people the Doctor meets or the companions that travel with him. This time it’s different.”
And Moffat said that the shape-shifting Zygons, who make their return in the episode, will help celebrate the past as they will be “exactly the same Zygon as Tom Baker fought back in the 70s”, while modern 3D technology – “integral” to the episode – will bring the episode right up to date.
“My first impulse was if we’re going to do 3D, it had to be part of the plot,” said Moffat. “We actually have to make 3D part of the story and if at all possible, to try and make 3D a bit scary. I wouldn’t say it’s in every scene, but there is an element of the show that exploits the fact of 3D.”