Winners of a Children in Need competition landed the prize of a visit to the studio where Doctor Who is filmed.
A suitably-dressed Dan Norris from Leicester opens the doors to the Tardis so the tour can begin.
The inside of the Tardis, which has taken Doctor Who and his assistants through galaxies and centuries.
How could a Doctor Who tour be complete without a visit from his most implacable enemy, the Dalek?
The Cybermen have been among Doctor Who's most fearsome foes over the years.
A young visitor gets close - but not too close - to an Ood.
Artwork helped visitors to the studio understand how Doctor Who and Torchwood have developed.
Torchwood star John Barrowman was on hand to explain how the magic is weaved to create the series.
The car from Torchwood, the Doctor Who spin-off series, was on show for visitors to the BBC Wales studio.