Peter Capaldi's first 'Doctor Who' episode is "thrilling".
Writer Mark Gattis has described the Twelfth Doctor as an exciting change from previous incarnations played by David Tennant and Matt Smith and thinks fans will be pleased with Peter's debut episode which was written by show boss Steven Moffat.
He said: "Peter has a very different energy to Matt Smith and to David Tennant. He's older which changes everything ... it's amazing what a change does!
"Matt was sublime and I was very sorry to see him go, but it's also great to have a change, as it has always been with the Doctor."
Mark looks forward to seeing how Peter's Time Lord tackles situations and reacts differently to the previous Doctors.
He added to Digital Spy: "The Doctor's always the Doctor - but you can have a lot of fun playing with people's expectations. Everyone knows how the previous Doctor would react in any given situation and now you just don't know!"
The eighth series of 'Doctor Who' is currently being filmed in Cardiff, Wales, with Peter being joined by Jenna-Louise Coleman, reprising her role as Clara Oswald.
It was recently revealed that former 'Emmerdale' actor Samuel Anderson is also joining the sci-fi drama as a recurring companion, Danny Pink.
Tagged in David Tennant Steven Moffat Peter Capaldi