When in Rome...SPOILERS!

The Doctor and his new companion Donna are set to travel back in time to the Roman Empire for the fourth series of Doctor Who.
In one of the most ambitious episodes to date, The Doctor, played by David Tennant and Donna (Catherine Tate) arrive in Pompeii in AD 79, on the eve of the historic eruption of Mount Vesuvius.
The Time Lord and his companion are posed with an immediate dilemma; should they warn the residents of Pompeii of the forthcoming catastrophe or leave them to fend for themselves?
"Arriving in Pompeii marks the start of another exciting adventure for the Doctor and Donna," said Doctor Who's Executive Producer and Head Writer, Russell T Davies. "Donna is stunned to find herself in the midst of history's most famous volcanic eruption. Viewers can expect many more ambitious storylines and a whole host of guest stars in 2008."
The Thick of It actor Peter Capaldi guest stars as Caecillius. He's joined by Quadrophenia and Rose and Maloney actor Phil Davis as Lucius. Further guest stars include Howards Way and Born and Bred Actress Tracey Childs, who plays Metella.
The filming of the episode took place at Cinecitta studios in Rome, which the Doctor Who team expertly transformed into Pompeii for a week of filming in September of this year.