Steven Moffat, showrunner and writer of the hit BBC show "Doctor Who," said that the new series of the television show would experience some of the biggest changes since its return back in 2005.

"We haven't made much of a change to Doctor Who since it came back in 2005. It's been the same show, it's maybe amped some things up and lowered some things but it's basically the same," Moffat said to the Hay Festival audience earlier in the week.

The show "needs to be surprising again", Moffat said, adding that now that they've gotten the hang of the show, they need to change it. Moffat also said that his choice of the 12th incarnation of the Doctor in Peter Capaldi was made with the intention of wanting to keep the show fresh.

After the year-long preparation of the 50th anniversary of "Doctor Who" and the departure of fan-favorite Matt Smith who played the 11th Doctor, news and updates on the upcoming eighth season have been comparatively scarce. Although casting announcements and photos of the set have been leaking out regularly, a major update from the production team has not been released. The season either preview was, in fact, merely a teaser and did no more than give the viewers a little sneak peak of the show's return. Still, several pieces of information were leaked, causing Moffat and his team to become more secretive.

Major changes in casting were made for the upcoming season, including the star of the show. Moffat said that they might have just "exposed the formula" if they had cast another young, handsome, and quirky man with entertaining hair. The casting of Capaldi represents a departure from the actors who previously played the role of the Doctor in former seasons. Nonetheless, that is just one key change to the popular show which promises to deliver big changes to keep things interesting.