A young fan was starstruck when he came face to face with his hero - and a few villains.
Sam Hill, five, was with parents Andy and Melanie watching the new Dr Who series being filmed.
And when there was a break in the action, which saw Cybermen marching up Womanby Street, he had the chance to meet new Doctor David Tennant. Mum-of-three Melanie, of Fleur-de-Lys, near Blackwood, said: 'We're all part of the Doctor Who Appreciation Society. Sam really wanted to go as he's a massive fan.'
During a break in filming, one of their friends approached the new Doctor and told him about his young fan.
Melanie, 33, said: 'He was such a lovely bloke and said it wasn't a problem. He picked Sam up and posed for a picture, asking if he'd seen the Christmas special. Sam was so thrilled and carried the picture around with him all day.'
Sam, a pupil at Fleur-de-Lys Primary School, said: 'I like the picture of me with him. It was really exciting to meet him.'