 The two @-@ parter took approximately six weeks in 2008 to film ; regular filming began on 18 February 2008 and ended on 29 March . The first scene shot for " The Stolen Earth " — a news report that starred <unk> Carl as Trinity Wells — was filmed on 31 January 2008 in a news studio at BBC Wales ' Broadcasting House . The first week of filming took place entirely at the show 's studios in Upper Boat , Rhondda Cynon Taf ; most of the scenes set in the Torchwood Hub and the TARDIS — including the regeneration scene — were filmed in the period . 
