Russell talks Kylie and Catherine in new DWM.
"This year's Christmas Special was always going to have a one-off companion, little knowing that it would be Kylie!," reveals head writer and executive producer Russell T Davies in a candid interview in the new issue of Doctor Who Magazine.
"I like the Christmas-ness of a one-off," he adds. "As you'll see, there's a whole new take - again - on what a companion can be..."
Russell also reveals secrets concerning the return of 'Runaway Bride' Donna... "She gives us the chance to be blunt about things, and be gobsmacked by things.
"Of course, she'll still be brave and heroic sometimes, and she'll save the Doctor's life, but equally... for example, there's one episode where they land on an alien planet, and the first thing she does is go back in the TARDIS to find the right coat!"
Also in the mag, Classic Series designer Barry Newbery is given a VIP tour of the Doctor Who studios; Edward Thomas gives an in-depth insight into production design and the Doctor and Martha begin a new comic strip adventure, The First. Plus, Gareth Roberts pens Production Notes.
DWM 386 goes on sale from Thursday 23 August 2007.