"What's weird is, I was going into an established, loved, successful show, so part of me was thinking, oh God, there's a responsibility there to that," Catherine revealed in the new issue of Doctor Who Magazine.
"But you can't go on set every day and think, 'I really hope I don't ruin this for everyone else involved!' You just have to realise, 'Yeah, I've taken this job, and the people around me wanted me to do it.'"
"Once you get down to the nuts and bolts of making the show, it was absolutely - and I can say this for certain - one of the best experiences of my professional life. Absolutely brilliant. There was just no down point."
Other highlights of the new issue include:
Original feisty redhead Bonnie Langford, aka companion Melanie Bush, talks candidly about her turbulant time on Doctor Who in the 1980s, whilst Carole Ann Ford talks about the latest Doctor Who audio adventures.
Pomp and circumstance... and Cybermen! DWM went behind the scenes at August's fantastic Doctor Who Prom, talking to composer Murray Gold and the people who made it happen.
Executive Producer Julie Gardner reveals what happened when she went to the USA with new showrunner Steven Moffat, in Production Notes.
It's a close shave for Peri, as The Time Team get their minds warped by The Trial of a Time Lord!
Fact of Fiction features Seventh Doctor adventure Delta and the Bannermen
Issue 399 of Doctor Who Magazine is out today, Thursday 21 August 2008, price £3.99.
