Doctor Who stars David Tennant and Billie Piper were in Cardiff to switch on the city's Christmas lights.

The duo were introduced by BBC Wales presenter Claire Summers and weatherman Derek Brockway

After getting the crowd to give a 10 second countdown, the pair switched on the lights by touching a plasma dial

Tennant and Piper admire the firework show to mark the start of the city's festive season

After putting Cardiff's Christmas on the space-time map, the 10th Doctor Who and his helper took the Tardis home